FrontierCode 2.0
Evaluates whether an agent can write code changes that OSS repository maintainers merge (v2.0).
- Category
- Agentic coding
- Unit
- Percent (%)
- Higher is better
- Comparison groups
- 1total
- Currently available model rankings · Ranked results: 15
- All models (records): Groups: 1 · Entries: 23
Rankings
Values with different source types (official, third-party, paper) or measurement conditions cannot be compared, so rankings are separated by comparison group (the same source, or sources verified to use the same conditions).
Rankings include only models currently available in Claude Code / Codex, excluding legacy models.
- View on rankings page (by metric)
- Cost balance (frontier and effort changes)
- Overall ranking (performance first)
official results (Introducing Claude Fable 5.2 and Claude Mythos 5.2)
| Rank | Model | effort | Score | Source cost (metric) | measured/reported by | source |
|---|---|---|---|---|---|---|
| 1 | Claude Fable 5.2 | Xhigh | 49.1% | $14.19Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.2 · Xhigh: 49.1% $14.19" |
| 2 | Claude Fable 5.2 | Max | 45.6% | $44.70Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.2 · Max: 45.6% $44.70" |
| 3 | Claude Opus 5.5 | Max | 45.5% | $12.82Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Opus 5.5 · Max: 45.5% $12.82" |
| 4 | Claude Fable 5.2 | High | 45.3% | $6.72Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.2 · High: 45.3% $6.72" |
| 5 | Claude Opus 5.5 | Xhigh | 43.4% | $5.18Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Opus 5.5 · Xhigh: 43.4% $5.18" |
| 6 | GPT-6 Astra | Max | 42.8% | $6.68Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "Max" was mapped to max in the OpenAI API reasoning effortSource excerptFrontierCode 2.0 — Accuracy vs. cost: "GPT-6 Astra · Max: 42.8% $6.68" |
| 7 | GPT-6 Astra | Xhigh | 41.4% | $4.54Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "Xhigh" was mapped to xhigh in the OpenAI API reasoning effortSource excerptFrontierCode 2.0 — Accuracy vs. cost: "GPT-6 Astra · Xhigh: 41.4% $4.54" |
| 8 | GPT-6 Astra | High | 38.3% | $4.28Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "High" was mapped to high in the OpenAI API reasoning effortSource excerptFrontierCode 2.0 — Accuracy vs. cost: "GPT-6 Astra · High: 38.3% $4.28" |
| 9 | Claude Fable 5.2 | Med | 37.6% | $2.48Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.2 · Med: 37.6% $2.48" |
| 10 | GPT-6 Astra | Med | 36.8% | $3.49Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "Med" was mapped to medium in the OpenAI API reasoning effortSource excerptFrontierCode 2.0 — Accuracy vs. cost: "GPT-6 Astra · Med: 36.8% $3.49" |
| 11 | Claude Opus 5.5 | High | 34.5% | $2.42Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Opus 5.5 · High: 34.5% $2.42" |
| 12 | Claude Fable 5.2 | Low | 34.2% | $2.10Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.2 · Low: 34.2% $2.10" |
| 13 | GPT-6 Astra | Low | 31.1% | $2.44Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "Low" was mapped to low in the OpenAI API reasoning effortSource excerptFrontierCode 2.0 — Accuracy vs. cost: "GPT-6 Astra · Low: 31.1% $2.44" |
| 14 | Claude Opus 5.5 | Med | 30.1% | $1.70Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Opus 5.5 · Med: 30.1% $1.70" |
| 15 | Claude Opus 5.5 | Low | 14.7% | $0.75Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Opus 5.5 · Low: 14.7% $0.75" |
All model rankings (records)
These rankings are recalculated by comparison group including legacy models and models unavailable in Claude Code / Codex. They differ from the rankings above because the set of models differs.
- View all model rankings (by metric)
- Cost balance (all models, records)
- Overall ranking (all models, records)
Show rankings including legacy and unavailable models (entries: 23)
official results (Introducing Claude Fable 5.2 and Claude Mythos 5.2)
| Rank | Model | effort | Score | Source cost (metric) | measured/reported by | source |
|---|---|---|---|---|---|---|
| 1 | Claude Fable 5.2 | Xhigh | 49.1% | $14.19Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.2 · Xhigh: 49.1% $14.19" |
| 2 | Claude Fable 5.2 | Max | 45.6% | $44.70Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.2 · Max: 45.6% $44.70" |
| 3 | Claude Opus 5.5 | Max | 45.5% | $12.82Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Opus 5.5 · Max: 45.5% $12.82" |
| 4 | Claude Fable 5.2 | High | 45.3% | $6.72Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.2 · High: 45.3% $6.72" |
| 5 | Claude Opus 5.5 | Xhigh | 43.4% | $5.18Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Opus 5.5 · Xhigh: 43.4% $5.18" |
| 6 | GPT-6 Astra | Max | 42.8% | $6.68Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "Max" was mapped to max in the OpenAI API reasoning effortSource excerptFrontierCode 2.0 — Accuracy vs. cost: "GPT-6 Astra · Max: 42.8% $6.68" |
| 7 | GPT-6 Astra | Xhigh | 41.4% | $4.54Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "Xhigh" was mapped to xhigh in the OpenAI API reasoning effortSource excerptFrontierCode 2.0 — Accuracy vs. cost: "GPT-6 Astra · Xhigh: 41.4% $4.54" |
| 8 | Gemini 4 Carbon | Med | 41.1% | $5.16Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "Med" was mapped to medium in the Gemini API thinking levelSource excerptFrontierCode 2.0 — Accuracy vs. cost: "Gemini 4 Carbon · Med: 41.1% $5.16" |
| 9 | Gemini 4 Carbon | High | 38.4% | $5.83Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "High" was mapped to high in the Gemini API thinking levelSource excerptFrontierCode 2.0 — Accuracy vs. cost: "Gemini 4 Carbon · High: 38.4% $5.83" |
| 10 | GPT-6 Astra | High | 38.3% | $4.28Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "High" was mapped to high in the OpenAI API reasoning effortSource excerptFrontierCode 2.0 — Accuracy vs. cost: "GPT-6 Astra · High: 38.3% $4.28" |
| 11 | Claude Fable 5.2 | Med | 37.6% | $2.48Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.2 · Med: 37.6% $2.48" |
| 12 | GPT-6 Astra | Med | 36.8% | $3.49Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "Med" was mapped to medium in the OpenAI API reasoning effortSource excerptFrontierCode 2.0 — Accuracy vs. cost: "GPT-6 Astra · Med: 36.8% $3.49" |
| 13 | Claude Opus 5.5 | High | 34.5% | $2.42Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Opus 5.5 · High: 34.5% $2.42" |
| 14 | Claude Fable 5.2 | Low | 34.2% | $2.10Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.2 · Low: 34.2% $2.10" |
| 15 | Claude Fable 5.1 | Xhigh | 32.4% | $8.68Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.1 · Xhigh: 32.4% $8.68" |
| 15 | Gemini 4 Carbon | Low | 32.4% | $5.49Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "Low" was mapped to low in the Gemini API thinking levelSource excerptFrontierCode 2.0 — Accuracy vs. cost: "Gemini 4 Carbon · Low: 32.4% $5.49" |
| 17 | Claude Fable 5.1 | Max | 31.7% | $11.46Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.1 · Max: 31.7% $11.46" |
| 18 | GPT-6 Astra | Low | 31.1% | $2.44Cost per task | not stated | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for a model from some other vendor (announced by Anthropic); the figure's effort label "Low" was mapped to low in the OpenAI API reasoning effortSource excerptFrontierCode 2.0 — Accuracy vs. cost: "GPT-6 Astra · Low: 31.1% $2.44" |
| 19 | Claude Opus 5.5 | Med | 30.1% | $1.70Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Opus 5.5 · Med: 30.1% $1.70" |
| 20 | Claude Fable 5.1 | High | 25.7% | $5.39Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.1 · High: 25.7% $5.39" |
| 21 | Claude Fable 5.1 | Med | 21.5% | $3.89Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.1 · Med: 21.5% $3.89" |
| 22 | Claude Fable 5.1 | Low | 20.6% | $3.01Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Fable 5.1 · Low: 20.6% $3.01" |
| 23 | Claude Opus 5.5 | Low | 14.7% | $0.75Cost per task | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2Retrieved 2026-11-12 · Vendor-reported value. A point in the figure "FrontierCode 2.0 / Accuracy vs. cost" on the Anthropic announcement page. values were taken from each point's aria-label (DOM); the page shows them only in the figure; value for its own model (announced by Anthropic)Source excerptFrontierCode 2.0 — Accuracy vs. cost: "Opus 5.5 · Low: 14.7% $0.75" |