Claude Mythos PreviewvsClaude Opus 4.6
Across 4 shared benchmarks, Claude Mythos Preview leads overall: Claude Mythos Preview wins 4, Claude Opus 4.6 wins 0, with 0 ties and an average score difference of +12.97.
Claude Mythos Preview
Anthropic · 2026-04-07 · Chat model
Claude Opus 4.6
Anthropic · 2026-02-05 · Reasoning model
Claude Mythos Preview4 wins(100%)(0%)0 winsClaude Opus 4.6
Benchmark scores
Grouped by capability, sorted by largest gap within each. 4 shared benchmarks.
AI Agent - Tool Usage
Claude Mythos Preview 2/2| Benchmark | Claude Mythos Preview | Claude Opus 4.6 | Diff |
|---|---|---|---|
| Terminal Bench 2.0 | 822 / 48Extended (with tools) | 65.4011 / 48Extended (with tools) | +16.60 |
| OSWorld-Verified | 79.608 / 26Extended (with tools) | 72.7016 / 26Extended (with tools) | +6.90 |
Coding and Software Engineer
Claude Mythos Preview 2/2| Benchmark | Claude Mythos Preview | Claude Opus 4.6 | Diff |
|---|---|---|---|
| SWE-bench Multilingual | 87.303 / 30Extended (with tools) | 7219 / 30Extended (with tools) | +15.30 |
| SWE-bench Verified | 93.904 / 116Extended (with tools) | 80.8410 / 116Extended (with tools) | +13.06 |
Specs
| Field | Claude Mythos Preview | Claude Opus 4.6 |
|---|---|---|
| Publisher | Anthropic | Anthropic |
| Release date | 2026-04-07 | 2026-02-05 |
| Model type | Chat model | Reasoning model |
| Architecture | Dense | Dense |
| Parameters | Not available | Not available |
| Context length | Not available | 1000K |
| Max output | 8K | 64K |
API pricing
Prices use DataLearner records when available; missing fields are not inferred.
| Item | Claude Mythos Preview | Claude Opus 4.6 |
|---|---|---|
| Text input | $25 / 1M tokens | $5 / 1M tokens |
| Text output | $125 / 1M tokens | $25 / 1M tokens |
| Cache read | Not public | $0.5 / 1M tokens |
| Cache write | Not public | $6.25 / 1M tokens |
Summary
- Claude Mythos Previewleads in:AI Agent - Tool Usage (2/2), Coding and Software Engineer (2/2)
On average across the 4 shared benchmarks, Claude Mythos Preview scores 12.97 higher.
Largest single-benchmark gap: Terminal Bench 2.0 — Claude Mythos Preview 82 vs Claude Opus 4.6 65.40 (+16.60).
Page generated from structured model, pricing and benchmark records. No real-time LLM is used to write the prose.