Claude Mythos 5.2 API Pricing
Claude Mythos 5.2 is the verified-access twin of Claude Fable 5.2: Anthropic says it is the same underlying model, released November 9, 2026 for organisations accepted into its Cyber and Life Sciences Verification Programs. The rate card is public - $8/M input, $40/M output, $0.20/M cache hits, every figure 20% below Mythos 5.1 - but there is no self-serve sign-up.
Claude Mythos 5.2 API cost calculator.
Live calculator pre-loaded with Claude Mythos 5.2's rates, which match Fable 5.2 exactly. Use it to budget an approved programme: a long vulnerability sweep over one cached codebase is the case where the $0.20 cache hit pays off most.
Claude Mythos 5.2 cost on real workloads.
Codebase vulnerability sweep
Literature synthesis pass
Incident triage
Scientific hypothesis pass
This is a chars-per-token approximation, not a real tokenizer. Actual tokens vary by language, code density, and tool-call overhead — counts are typically ±10–20% off for English prose, more for code or non-Latin scripts. For exact billing, use the vendor's official tokenizer.
| Model | Input /M | Output /M | Effective blended | Context | Best for |
|---|---|---|---|---|---|
| Claude Mythos 5.2 Current | $8.00 cache $0.20 | $40.00 | $5.01 agentic 92/8 | 1M | Verified cyber and life-sciences teams |
| Claude Fable 5.2 | $8.00 cache $0.20 | $40.00 | $5.01 same | 1M | The version anyone can call |
| Claude Mythos 5.1 | $10.00 cache $0.25 | $50.00 | $6.26 +25% | 1M | The row this one replaces |
| Claude Opus 5.5 | $4.00 cache $0.20 | $20.00 | $2.58 −48% | 1M | Anthropic's recommended starting point |
| Claude Sonnet 5.5 | $2.00 cache $0.10 | $10.00 | $1.29 −3.9× | 1M | Most production workloads |
Claude Mythos 5.2 has published scores on 1 benchmark we track, and leads Terminal-Bench-Science. All of them are the lab's own reports; each row links to the page that published it.
| Benchmark | Score | Rank | Leader | Source |
|---|---|---|---|---|
| Terminal-Bench-Science AI research | 75.3% highest available effort | #1 of 12 | Claude Mythos 5.2 leads | Vendor-reported Anthropic |
Claude Mythos 5.2 API pricing FAQ.
Who can use Mythos 5.2, what it costs once you are in, and how it differs from Fable 5.2.
Q · 01 What is Claude Mythos 5.2 priced at? +
$8/M base input, $10.00/M 5-minute cache writes, $16/M 1-hour cache writes, $0.20/M cache hits and $40/M output, with batch at $4/M and $20/M. Under this site's 92/8 agentic blend at an 82% cache-hit rate that is $5.01/M. Fast mode is $16/M and $80/M, available only to organisations in the Verification Programs.Q · 02 Can I sign up for it? +
Q · 03 What changed from Claude Mythos 5.1? +
$6.26/M on Mythos 5.1 to $5.01/M, a 20% saving under any token mix.