Claude Mythos PreviewvsGemini 3.1 Pro Preview
Across 8 shared benchmarks, Claude Mythos Preview leads overall: Claude Mythos Preview wins 7, Gemini 3.1 Pro Preview wins 1, with 0 ties and an average score difference of +90.88.
Claude Mythos Preview
Anthropic · 2026-04-07 · Chat model
Gemini 3.1 Pro Preview
Google Deep Mind · 2026-02-20 · Multimodal model
Claude Mythos Preview7 wins(88%)(13%)1 winGemini 3.1 Pro Preview
Benchmark scores
Grouped by capability, sorted by largest gap within each. 8 shared benchmarks.
AI Agent - Tool Usage
Claude Mythos Preview 2/2| Benchmark | Claude Mythos Preview | Gemini 3.1 Pro Preview | Diff |
|---|---|---|---|
| Terminal Bench 2.0 | 822 / 48Extended (with tools) | 68.508 / 48Thinking High (With Tools) | +13.50 |
| OSWorld-Verified | 79.608 / 26Extended (with tools) | 76.2012 / 26Thinking (With Tools) | +3.40 |
Coding and Software Engineer
Claude Mythos Preview 2/2| Benchmark | Claude Mythos Preview | Gemini 3.1 Pro Preview | Diff |
|---|---|---|---|
| SWE-Bench Pro - Public | 77.803 / 57Extended (with tools) | 54.2034 / 57Thinking High (With Tools) | +23.60 |
| SWE-bench Verified | 93.904 / 114Extended (with tools) | 80.6011 / 114Thinking High (With Tools) | +13.30 |
Agent Level Benchmark
Claude Mythos Preview 1/1| Benchmark | Claude Mythos Preview | Gemini 3.1 Pro Preview | Diff |
|---|---|---|---|
| METR Time Horizons v1.1 | 1,0451 / 22Normal (With Tools) | 384.152 / 22Normal (With Tools) | +660.63 |
AI Agent - Information Search
Gemini 3.1 Pro Preview 1/1| Benchmark | Claude Mythos Preview | Gemini 3.1 Pro Preview | Diff |
|---|---|---|---|
| BrowseComp | 84.906 / 54Extended (with tools) | 85.905 / 54Thinking High (With Tools + Internet) | -1 |
General Evaluation
Claude Mythos Preview 1/1| Benchmark | Claude Mythos Preview | Gemini 3.1 Pro Preview | Diff |
|---|---|---|---|
| GPQA Diamond | 94.601 / 226Extended (no tools) | 94.304 / 226Thinking High (No Tools) | +0.30 |
General Knowledge
Claude Mythos Preview 1/1| Benchmark | Claude Mythos Preview | Gemini 3.1 Pro Preview | Diff |
|---|---|---|---|
| HLE | 64.701 / 181Extended (with tools) | 51.4024 / 181Thinking High (With Tools) | +13.30 |
Specs
| Field | Claude Mythos Preview | Gemini 3.1 Pro Preview |
|---|---|---|
| Publisher | Anthropic | Google Deep Mind |
| Release date | 2026-04-07 | 2026-02-20 |
| Model type | Chat model | Multimodal model |
| Architecture | Dense | Dense |
| Parameters | Not available | Not available |
| Context length | Not available | 1M |
| Max output | 8K | 64K |
API pricing
Prices use DataLearner records when available; missing fields are not inferred.
| Item | Claude Mythos Preview | Gemini 3.1 Pro Preview |
|---|---|---|
| Text input | $25 / 1M tokens | $2 / 1M tokens |
| Text output | $125 / 1M tokens | $12 / 1M tokens |
Summary
- Claude Mythos Previewleads in:AI Agent - Tool Usage (2/2), Coding and Software Engineer (2/2), Agent Level Benchmark (1/1), General Evaluation (1/1), General Knowledge (1/1)
- Gemini 3.1 Pro Previewleads in:AI Agent - Information Search (1/1)
On average across the 8 shared benchmarks, Claude Mythos Preview scores 90.88 higher.
Largest single-benchmark gap: METR Time Horizons v1.1 — Claude Mythos Preview 1,045 vs Gemini 3.1 Pro Preview 384.15 (+660.63).
Page generated from structured model, pricing and benchmark records. No real-time LLM is used to write the prose.