Claude Mythos 5.2
- Input price
- $8.00
- Per 1 million tokens (USD)
- Output price
- $40.00
- Per 1 million tokens (USD)
- Effort levels
- 5total
- Default: High
- Benchmark results
- 8total
- Benchmark types: 4
Model information
- API model ID
- claude-mythos-5-2
- release date
- 2026-11-09
- effort
- Low / Med / High (default) / Xhigh / Max
- Effort source
- Based on Anthropic effort documentation (platform.claude.com/docs/en/build-with-claude/effort).
- Claude Code
- unknown
- Codex
- unavailable
- Availability notes
- Mythos is not stated on the Claude Code model settings page. It uses the same base model as Fable 5.2, with cyber / biological safeguards removed. Only for organizations approved for the Cyber / Life Sciences Verification Program. Codex's official model list (learn.chatgpt.com/docs/models) contains only OpenAI models, so codex is false (connections via a custom provider are not counted as official options).
- Availability source
- https://code.claude.com/docs/en/model-config
Price (USD per 1 million tokens)
Prices do not vary by effort; token consumption does.
| input | $8.00 |
|---|---|
| output | $40.00 |
| cache read | $0.20 |
| cache write | $10.00 |
cacheWritePerMTok is for a 5-minute cache write. 1h write $16. cache read 0.025x. fast mode $16/$80 (Claude API).
Claude Mythos 5.2 (limited availability) | $8 / MTok | $10 / MTok | $16 / MTok | $0.20 / MTok | $40 / MTokSource: https://platform.claude.com/docs/en/about-claude/pricing
Benchmark results
| Benchmark | effort | Score | Source cost (metric) | measured/reported by | source | Conditions and extraction method |
|---|---|---|---|---|---|---|
| Terminal-Bench-Science 0.1not stated | not stated | 75.3% | — | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2official · Retrieved 2026-11-12 | Vendor-reported value. table note: Scores for Fable 5.2, Fable 5.1, and Opus 5.5 show results with safeguards on unless otherwise noted. All scores show each model’s highest-available effort unless otherwise noted.transcribed from tableSource excerpt75.3%Location Table, Terminal-Bench-Science 0.1 row: 74.6% 75.3% (Mythos 5.2) |
| CVE RediscoveryLow | Low | 72.4% | $0.34Cost per attempt | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2official · Retrieved 2026-11-12 | Vendor-reported value. A point in the figure "CVE Rediscovery / 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)transcribed from textSource excerptCVE Rediscovery — Accuracy vs. cost: "Mythos 5.2 · Low: 72.4% $0.34" |
| CVE RediscoveryMed | Med | 73.3% | $0.40Cost per attempt | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2official · Retrieved 2026-11-12 | Vendor-reported value. A point in the figure "CVE Rediscovery / 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)transcribed from textSource excerptCVE Rediscovery — Accuracy vs. cost: "Mythos 5.2 · Med: 73.3% $0.40" |
| CVE RediscoveryHigh (default) | High | 83.2% | $1.01Cost per attempt | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2official · Retrieved 2026-11-12 | Vendor-reported value. A point in the figure "CVE Rediscovery / 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)transcribed from textSource excerptCVE Rediscovery — Accuracy vs. cost: "Mythos 5.2 · High: 83.2% $1.01" |
| CVE RediscoveryXhigh | Xhigh | 88.1% | $2.40Cost per attempt | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2official · Retrieved 2026-11-12 | Vendor-reported value. A point in the figure "CVE Rediscovery / 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)transcribed from textSource excerptCVE Rediscovery — Accuracy vs. cost: "Mythos 5.2 · Xhigh: 88.1% $2.40" |
| CVE RediscoveryMax | Max | 89.6% | $9.13Cost per attempt | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2official · Retrieved 2026-11-12 | Vendor-reported value. A point in the figure "CVE Rediscovery / 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)transcribed from textSource excerptCVE Rediscovery — Accuracy vs. cost: "Mythos 5.2 · Max: 89.6% $9.13" |
| CyScenarioBenchnot stated | not stated | 76.3% | — | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2official · Retrieved 2026-11-12 | Vendor-reported value. table note: Scores for Fable 5.2, Fable 5.1, and Opus 5.5 show results with safeguards on unless otherwise noted. All scores show each model’s highest-available effort unless otherwise noted.transcribed from tableSource excerpt76.3%Location Table, CyScenarioBench row: 76.3% Mythos 5.2 |
| De novo binder design (24 hours)not stated | not stated | 85.1 | — | Anthropic | Introducing Claude Fable 5.2 and Claude Mythos 5.2official · Retrieved 2026-11-12 | Vendor-reported value. table note: Scores for Fable 5.2, Fable 5.1, and Opus 5.5 show results with safeguards on unless otherwise noted. All scores show each model’s highest-available effort unless otherwise noted.transcribed from tableSource excerpt85.1Location Table, Protein design row: 85.1 Mythos 5.2 |
Related rankings
- Overall ranking (all models, records)
- Terminal-Bench-Science 0.1 ranking by metric (all models, records)
- CVE Rediscovery ranking by metric (all models, records)
- CyScenarioBench ranking by metric (all models, records)
- De novo binder design (24 hours) ranking by metric (all models, records)
- Recommendations by role