Claude Mythos 5 vs DeepSeek V4 Flash
Claude Mythos 5 (2026) and DeepSeek V4 Flash (2026) are frontier-tier reasoning models from Anthropic and DeepSeek. Claude Mythos 5 ships a 1m-token context window, while DeepSeek V4 Flash ships a 1m-token context window. On pricing, DeepSeek V4 Flash costs $0.10/1M input tokens versus $10/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
DeepSeek V4 Flash is ~10073% cheaper at $0.10/1M; pay for Claude Mythos 5 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Claude Mythos 5 | DeepSeek V4 Flash |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps, tool-calling agents, and long-context analysis |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1m | 1m |
| Cheapest output | $50/1M tokens | $0.20/1M tokens |
| Provider routes | 3 tracked | 5 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Claude Mythos 5 uniquely exposes Vision, Multimodal, and Code execution in local model data.
- Local decision data tags Claude Mythos 5 for Coding, RAG, and Agents.
- DeepSeek V4 Flash has the lower cheapest tracked output price at $0.20/1M tokens.
- DeepSeek V4 Flash has broader tracked provider coverage for fallback and procurement flexibility.
- Local decision data tags DeepSeek V4 Flash for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude Mythos 5
$20,500
Cheapest tracked route/tier: Anthropic
DeepSeek V4 Flash
$128
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $20,372. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Claude Mythos 5 and DeepSeek V4 Flash; plan for SDK, billing, or endpoint changes.
- DeepSeek V4 Flash is $49.80/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and Code execution before moving production traffic.
- No overlapping tracked provider route is sourced for DeepSeek V4 Flash and Claude Mythos 5; plan for SDK, billing, or endpoint changes.
- Claude Mythos 5 is $49.80/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude Mythos 5 adds Vision, Multimodal, and Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-06-09 | 2026-04-24 |
| Context window | 1m | 1m |
| Parameters | — | 284B |
| Architecture | Decoder Only | Mixture of Experts |
| License | Proprietary | MITOSI-approved |
| Openness | Proprietary | Open source |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Claude Mythos 5 | DeepSeek V4 Flash |
|---|---|---|
| Input price | $10/1M tokens | $0.10/1M tokens |
| Output price | $50/1M tokens | $0.20/1M tokens |
| Providers |
Capabilities
| Capability | Claude Mythos 5 | DeepSeek V4 Flash |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
Deep dive
The capability footprint differs most on vision: Claude Mythos 5, multimodal input: Claude Mythos 5, and code execution: Claude Mythos 5. Both models share reasoning mode, function calling, tool use, and structured outputs, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Claude Mythos 5 lists $10/1M input and $50/1M output tokens on the cheapest tracked provider, while DeepSeek V4 Flash lists $0.10/1M input and $0.20/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts DeepSeek V4 Flash lower by about $21.87 per million blended tokens. Availability is 3 providers versus 5, so concentration risk also matters.
Choose Claude Mythos 5 when coding workflow support are central to the workload. Choose DeepSeek V4 Flash when provider fit, lower input-token cost, and broader provider choice are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions.
FAQ
Which has a larger context window, Claude Mythos 5 or DeepSeek V4 Flash?
Claude Mythos 5 supports 1m tokens, while DeepSeek V4 Flash supports 1m tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Claude Mythos 5 or DeepSeek V4 Flash?
DeepSeek V4 Flash is cheaper on tracked token pricing. Claude Mythos 5 costs $10/1M input and $50/1M output tokens. DeepSeek V4 Flash costs $0.10/1M input and $0.20/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Mythos 5 or DeepSeek V4 Flash open source?
Claude Mythos 5 is listed under Proprietary. DeepSeek V4 Flash is listed under MIT. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude Mythos 5 or DeepSeek V4 Flash?
Claude Mythos 5 has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, Claude Mythos 5 or DeepSeek V4 Flash?
Claude Mythos 5 has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Claude Mythos 5 and DeepSeek V4 Flash?
Claude Mythos 5 is available on Anthropic, AWS Bedrock, and GCP Vertex AI. DeepSeek V4 Flash is available on DeepSeek Platform, OpenRouter, Microsoft Foundry, Vercel AI Gateway, and Novita AI. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-06-15. Data sourced from public model cards and provider documentation.