Claude Mythos 5.1 vs Gemini 3.1 Pro
Why this pair: Trusted-access Claude profile versus Google's frontier multimodal model
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | Claude Mythos 5.1 | Gemini 3.1 Pro |
|---|---|---|
| Developer | Anthropic | Google DeepMind |
| Family | Claude 5 1 | Gemini 3 |
| Model | Claude Mythos 5.1 | Gemini 3.1 Pro |
| Version | Claude Mythos 5.1 | Gemini 3.1 Pro |
| Lifecycle | active | preview |
| Released | 2026-09-01 | Unknown |
| Knowledge cutoff | 2026-06-01 | Unknown |
| Input modalities | Text, Image | Text, Image, Video, Audio, Document |
| Output modalities | Text | Text |
| Context window | 1,000,000 | 1,048,576 |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Unknown | Google AI (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, tools |
12 comparable fields · 7 material differences · Editorially curated pair passes the primary-source comparison gate
Claude Mythos 5.1 Capabilities
Gemini 3.1 Pro Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
Claude Fable 5Anthropic | vs | Claude Mythos 5.1Anthropic | family variantsimage, text |
Claude Mythos 5.1Anthropic | vs | Claude Opus 5Anthropic | family variantsimage, text |
Claude Mythos 5.1Anthropic | vs | Claude Sonnet 5Anthropic | family variantsimage, text |
Claude Mythos 5.1Anthropic | vs |  GPT-5.6 SolOpenAI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs | Gemini 3.1 ProGoogle DeepMind | cross-developer peerstext |
Claude Mythos 5.1Anthropic | vs | Grok 4.6xAI | cross-developer peersimage, text |
 DeepSeek-V4-Flash-Vision-ExpDeepSeek | vs | Gemini 3.1 ProGoogle DeepMind | cross-developer peerstext |
Claude Mythos 5.1Anthropic | vs |  Kimi-K3Moonshot AI | cross-developer peersimage, text |
Gemini 3.1 ProGoogle DeepMind | vs |  Hy4 previewTencent | cross-developer peerstext |
Gemini 2.5 ProGoogle DeepMind | vs | Gemini 3.1 ProGoogle DeepMind | family variantstext |
Gemini 3.1 ProGoogle DeepMind | vs | Gemini 3.5 FlashGoogle DeepMind | family variantstext |
Claude Mythos 5.1Anthropic | vs | Claude Opus 4.8Anthropic | family variantsimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Mythos 5.1 vs Gemini 3.1 Pro FAQs
Is Claude Mythos 5.1 or Gemini 3.1 Pro better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Mythos 5.1 and Gemini 3.1 Pro, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Mythos 5.1 or Gemini 3.1 Pro?+
Only Gemini 3.1 Pro has a directly sourced input price: $2.00 per million tokens. Only Gemini 3.1 Pro has a directly sourced output price: $12.00 per million tokens.
Which has a larger context window, Claude Mythos 5.1 or Gemini 3.1 Pro?+
Gemini 3.1 Pro has the larger sourced context window. Claude Mythos 5.1 supports 1,000,000 and Gemini 3.1 Pro supports 1,048,576.
Which performs better in benchmarks, Claude Mythos 5.1 or Gemini 3.1 Pro?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Claude Mythos 5.1 or Gemini 3.1 Pro be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Mythos 5.1 is not marked open weight; Gemini 3.1 Pro is not marked open weight.
Can Claude Mythos 5.1 and Gemini 3.1 Pro understand images?+
Claude Mythos 5.1 is documented with image input; Gemini 3.1 Pro is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Mythos 5.1 or Gemini 3.1 Pro?+
Claude Mythos 5.1 has the larger sourced maximum output: Claude Mythos 5.1 supports 128,000 and Gemini 3.1 Pro supports 65,536 output tokens.
Do Claude Mythos 5.1 and Gemini 3.1 Pro support reasoning and tool use?+
Claude Mythos 5.1: reasoning, tool calling, and image input. Gemini 3.1 Pro: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Mythos 5.1 or Gemini 3.1 Pro?+
Claude Mythos 5.1 has 0 sourced provider routes; Gemini 3.1 Pro has 1, so Gemini 3.1 Pro has broader tracked availability.
Which offers better value, Claude Mythos 5.1 or Gemini 3.1 Pro?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.