Claude Mythos 5.1 vs DeepSeek V4 Flash Base
At a Glance
| Compare | Claude Mythos 5.1Anthropic |  DeepSeek V4 Flash BaseDeepSeek |
|---|---|---|
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $10.00Anthropic ↗ · Sep 2, 2026 | Not reported |
| Output priceFrom · USD / 1M tokens | $50.00Anthropic ↗ · Sep 2, 2026 | Not reported |
| 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 | DeepSeek-V4-Flash-Base |
|---|---|---|
| Developer | Anthropic | DeepSeek |
| Family | Claude 5 1 | Deepseek V4 Flash Base |
| Model | Claude Mythos 5.1 | DeepSeek-V4-Flash-Base |
| Version | Claude Mythos 5.1 | DeepSeek-V4-Flash-Base |
| Lifecycle | active | active |
| Released | 2026-09-01 | 2026-04-24 |
| Knowledge cutoff | 2026-06-01 | Unknown |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
| Context window | 1,000K | 1,049K |
| Total parameters | Unknown | 292B |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | Yes |
| API available | Yes | Unknown |
| Self-hostable | No | Yes |
| Provider access | Anthropic (Project Glasswing) | Unknown |
| Capabilities | chat, generation, reasoning, tools | generation |
Claude Mythos 5.1 Capabilities
DeepSeek V4 Flash Base Capabilities
Related Comparisons
All text comparisons →| A | Pair | B | Context |
|---|---|---|---|
Claude Mythos 5.1Anthropic | vs |  GPT-6 AstraOpenAI | cross-developer peersimage, text |
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 | DeepSeek-V4.1-FlashDeepSeek | cross-developer peersimage, text |
Claude Mythos 5.1Anthropic | vs | Grok 4.6xAI | cross-developer peersimage, text |
Claude Mythos 5.1Anthropic | vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text |
Claude Mythos 5.1Anthropic | vs |  Kimi-K3Moonshot AI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | Claude Mythos 5.1Anthropic | cross-developer peersimage, text |
Claude Mythos 5.1Anthropic | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Claude Mythos 5.1Anthropic | vs |  Hy4 previewTencent | cross-developer peerstext |
Claude Mythos 5.1Anthropic | vs | Seed 2.1 ProByteDance Seed | cross-developer peersimage, text |
Claude Mythos 5.1Anthropic | vs |  Mistral Large 3Mistral AI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Mythos 5.1 vs DeepSeek V4 Flash Base FAQs
Is Claude Mythos 5.1 or DeepSeek V4 Flash Base better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Mythos 5.1 and DeepSeek V4 Flash Base, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Mythos 5.1 or DeepSeek V4 Flash Base?+
Only Claude Mythos 5.1 has a directly sourced input price: $10.00 per million tokens. Only Claude Mythos 5.1 has a directly sourced output price: $50.00 per million tokens.
Which has a larger context window, Claude Mythos 5.1 or DeepSeek V4 Flash Base?+
DeepSeek V4 Flash Base has the larger sourced context window. Claude Mythos 5.1 supports 1,000K and DeepSeek V4 Flash Base supports 1,049K.
Which performs better in benchmarks, Claude Mythos 5.1 or DeepSeek V4 Flash Base?+
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 DeepSeek V4 Flash Base be self-hosted?+
DeepSeek V4 Flash Base is the only model in this pair currently marked as self-hostable. Claude Mythos 5.1 is not marked open weight; DeepSeek V4 Flash Base is open weight.
Can Claude Mythos 5.1 and DeepSeek V4 Flash Base understand images?+
Claude Mythos 5.1 is documented with image input; DeepSeek V4 Flash Base is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Mythos 5.1 or DeepSeek V4 Flash Base?+
Neither has a larger sourced maximum output. Claude Mythos 5.1 is 128K and DeepSeek V4 Flash Base is —.
Do Claude Mythos 5.1 and DeepSeek V4 Flash Base support reasoning and tool use?+
Claude Mythos 5.1: reasoning, tool calling, and image input. DeepSeek V4 Flash Base: none of these features are definitively sourced. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Mythos 5.1 or DeepSeek V4 Flash Base?+
Claude Mythos 5.1 has 1 sourced provider route; DeepSeek V4 Flash Base has 0, so Claude Mythos 5.1 has broader tracked availability.
Which offers better value, Claude Mythos 5.1 or DeepSeek V4 Flash Base?+
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.