Claude Mythos PreviewvsClaude Opus 4.6
Across 7 shared benchmarks, Claude Mythos Preview leads overall: Claude Mythos Preview wins 7, Claude Opus 4.6 wins 0, with 0 ties and an average score difference of +9.68.
Claude Mythos Preview
Anthropic · 2026-04-07 · Chat model
Claude Opus 4.6
Anthropic · 2026-02-05 · Reasoning model
Claude Mythos Preview7 wins(100%)(0%)0 winsClaude Opus 4.6
Benchmark scores
Grouped by capability, sorted by largest gap within each. 7 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 / 46Extended (with tools) | 65.4011 / 46Extended (with tools) | +16.60 |
| OSWorld-Verified | 79.603 / 18Extended (with tools) | 72.709 / 18Extended (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 | 87.301 / 20Extended (with tools) | 7212 / 20Extended (with tools) | +15.30 |
| SWE-bench Verified | 93.903 / 108Extended (with tools) | 80.849 / 108Extended (with tools) | +13.06 |
General Knowledge
Claude Mythos Preview 2/2| Benchmark | Claude Mythos Preview | Claude Opus 4.6 | Diff |
|---|---|---|---|
| HLE | 64.701 / 157Extended (with tools) | 5311 / 157Extended (with tools, internet) | +11.70 |
| GPQA Diamond | 94.601 / 178Extended (no tools) | 91.3114 / 178Extended (no tools) | +3.29 |
AI Agent - Information Search
Claude Mythos Preview 1/1| Benchmark | Claude Mythos Preview | Claude Opus 4.6 | Diff |
|---|---|---|---|
| BrowseComp | 84.904 / 45Extended (with tools) | 847 / 45Thinking (With Tools + Internet) | +0.90 |
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 | $0.5 / 1M tokens |
| Text output | $125 / 1M tokens | $25 / 1M tokens |
| Cache read | Not public | $0.5 / 1M tokens |
| Cache write | Not public | $10 / 1M tokens |
Summary
- Claude Mythos Previewleads in:AI Agent - Tool Usage (2/2), Coding and Software Engineer (2/2), General Knowledge (2/2), AI Agent - Information Search (1/1)
On average across the 7 shared benchmarks, Claude Mythos Preview scores 9.68 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.