Claude Mythos 5.1 vs Kimi K3
At a Glance
| Compare | Claude Mythos 5.1Anthropic |  Kimi K3Moonshot AI |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v4.4 | UnrankedNot in the 57-model eligible cohort | #13 of 5773.3 score · 3/3 sources · complete |
| CostLower is better · Published-token output estimate | UnrankedNot in the 27-model eligible cohort | #19 of 27$0.163 per LiveBench case |
| EfficiencyHigher is better · MM Efficiency v1.9 | UnrankedNot in the 27-model eligible cohort | #12 of 2750.1 score · 3/3 sources · complete |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $10.00Anthropic ↗ · Sep 2, 2026 | $0.239Openrouter ↗ · Oct 19, 2026 |
| Output priceFrom · USD / 1M tokens | $50.00Anthropic ↗ · Sep 2, 2026 | $11.936Openrouter ↗ · Oct 19, 2026 |
| Context windowMaximum documented tokens | 1,000K | 1,049K |
| Model facts checked | Sep 2, 2026View model evidence → | Aug 28, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
Side-by-Side Facts
| Field | Claude Mythos 5.1 | Kimi-K3 |
|---|---|---|
| Developer | Anthropic | Moonshot AI |
| Family | Claude 5 1 | Kimi K3 |
| Model | Claude Mythos 5.1 | Kimi-K3 |
| Version | Claude Mythos 5.1 | Kimi-K3 |
| Lifecycle | active | active |
| Released | 2026-09-01 | 2026-07-16 |
| Knowledge cutoff | 2026-06-01 | Unknown |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,000K | 1,049K |
| Total parameters | Unknown | 2.78T |
| Active parameters | Unknown | 104B |
| License | Unknown | other |
| Open weights | No | Yes |
| API available | Yes | Yes |
| Self-hostable | No | Yes |
| Provider access | Anthropic (Project Glasswing) | Deepinfra (Standard), Fireworks Ai (Standard), Hugging Face (Standard), Openrouter (Standard), Together Ai (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning |
Claude Mythos 5.1 Capabilities
Kimi K3 Capabilities
Related Comparisons
All image comparisons →| A | Pair | B | Context |
|---|---|---|---|
Claude Fable 5.1Anthropic | vs | Claude Mythos 5.1Anthropic | family variantsimage, text |
Claude Mythos 5.1Anthropic | vs |  Gemini 3.1 ProGoogle DeepMind | cross-developer peerstext |
Claude Mythos 5.1Anthropic | vs | Grok 4.6xAI | cross-developer peersimage, text |
Claude Mythos 5.1Anthropic | vs | Claude Sonnet 5Anthropic | family variantsimage, text |
Claude Mythos 5.1Anthropic | vs | Gemini 3.8 Flash CyberGoogle DeepMind | cross-developer peerstext |
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 |  GPT-4.1 NanoOpenAI | cross-developer peersimage, text |
Claude Mythos 5.1Anthropic | vs | GPT-5.6 SolOpenAI | cross-developer peersimage, text |
Claude Mythos 5.1Anthropic | vs |  Qwen3.7 MaxQwen | cross-developer peersimage, text |
Claude Mythos 5.1Anthropic | vs | Grok 4.3xAI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Mythos 5.1 vs Kimi K3 FAQs
Is Claude Mythos 5.1 or Kimi K3 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Mythos 5.1 and Kimi K3, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Mythos 5.1 or Kimi K3?+
Claude Mythos 5.1 is $10.00 and Kimi K3 is $0.239 per million tokens, so Kimi K3 is cheaper on this metric. Claude Mythos 5.1 is $50.00 and Kimi K3 is $11.936 per million tokens, so Kimi K3 is cheaper on this metric.
Which has a larger context window, Claude Mythos 5.1 or Kimi K3?+
Kimi K3 has the larger sourced context window. Claude Mythos 5.1 supports 1,000,000 tokens and Kimi K3 supports 1,048,576 tokens.
Which performs better in benchmarks, Claude Mythos 5.1 or Kimi K3?+
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 Kimi K3 be self-hosted?+
Kimi K3 is documented as self-hostable; Claude Mythos 5.1 is documented as not self-hostable. Claude Mythos 5.1 is not marked open weight; Kimi K3 is open weight.
Can Claude Mythos 5.1 and Kimi K3 understand images?+
Claude Mythos 5.1 is documented with image input; Kimi K3 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Mythos 5.1 or Kimi K3?+
Claude Mythos 5.1 has a sourced maximum output of 128,000 tokens; Kimi K3's maximum output is not reported. A larger limit cannot be determined.
Do Claude Mythos 5.1 and Kimi K3 support reasoning and tool use?+
Claude Mythos 5.1: reasoning, tool calling, and image input. Kimi K3: reasoning and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Mythos 5.1 or Kimi K3?+
Claude Mythos 5.1 has 1 sourced provider route; Kimi K3 has 5, so Kimi K3 has broader tracked availability.
Which offers better value, Claude Mythos 5.1 or Kimi K3?+
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.