# Claude Mythos vs Gemini 3 Ultra (2026): Benchmarks, Price & Verdict | Alher Tech

> Claude Mythos vs Gemini 3 Ultra: head-to-head 2026 comparison across Arena Elo, MMLU, GPQA, HumanEval, context window and pricing. Verdict + use cases.

- Canonical page: https://alhertech.com/en/ai-comparison/claude-mythos-vs-gemini-3-ultra/
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|  | Claude Mythos | Gemini 3 Ultra |
| --- | --- | --- |
| arenaElo | 1478 | 1441 |
| humanEval | 98.7 | 91 |
| sweBench | 93.9 | 66 |
| mmlu | 94.2 | 93.4 |
| gpqa | 94.6 | 72.6 |
| aime | 97.6 | 93 |
| Price in/out ($/M) | $25 / $125 | $18 / $72 |

## Our verdict

Gemini 3 Ultra has a 3× larger context window (3M vs 1M) and native video, which Mythos does not match. Mythos returns the favor on raw capability: ~23 GPQA points and ~8 HumanEval points ahead, plus saturated cybersecurity benchmarks. For whole-movie or 2000-page workloads on Vertex AI, Ultra is the right pick. For frontier reasoning and code where your data fits in 1M tokens, Mythos, if you can get access.

[Claude Mythos](https://alhertech.com/en/ai-comparison/claude-mythos/) · [Gemini 3 Ultra](https://alhertech.com/en/ai-comparison/gemini-3-ultra/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)