Claude Mythos 5 vs Claude Mythos Preview
Claude Mythos 5 (2026) and Claude Mythos Preview (2026) are frontier-tier reasoning models from Anthropic. Claude Mythos 5 ships a 1m-token context window, while Claude Mythos Preview ships a 1m-token context window. On pricing, Claude Mythos 5 costs $10/1M input tokens versus $25/1M 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.
Claude Mythos 5 is ~150% cheaper at $10/1M; pay for Claude Mythos Preview only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Claude Mythos 5 | Claude Mythos Preview |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1m | 1m |
| Cheapest output | $50/1M tokens | $125/1M tokens |
| Provider routes | 3 tracked | 2 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Claude Mythos 5 has the lower cheapest tracked output price at $50/1M tokens.
- Claude Mythos 5 has broader tracked provider coverage for fallback and procurement flexibility.
- Local decision data tags Claude Mythos 5 for Coding, RAG, and Agents.
- Local decision data tags Claude Mythos Preview 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
Claude Mythos Preview
$51,250
Cheapest tracked route/tier: Anthropic
Estimated monthly gap: $30,750. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on Anthropic; start route-level A/B tests there.
- Claude Mythos Preview is $75/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Provider overlap exists on Anthropic; start route-level A/B tests there.
- Claude Mythos 5 is $75/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-06-09 | 2026-05-01 |
| Context window | 1m | 1m |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Commercial use | Commercial use with conditions | Commercial use with conditions |
| Knowledge cutoff | - | 2025-12 |
Pricing and availability
| Pricing attribute | Claude Mythos 5 | Claude Mythos Preview |
|---|---|---|
| Input price | $10/1M tokens | $25/1M tokens |
| Output price | $50/1M tokens | $125/1M tokens |
| Providers |
Capabilities
| Capability | Claude Mythos 5 | Claude Mythos Preview |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint is close: both models cover vision, multimodal input, reasoning mode, function calling, and tool use. That makes context budget, benchmark fit, and provider maturity more important than a simple checklist. If your application depends on one integration detail, verify it against the provider route you plan to use, not just the base model listing.
For cost, Claude Mythos 5 lists $10/1M input and $50/1M output tokens on the cheapest tracked provider, while Claude Mythos Preview lists $25/1M input and $125/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Claude Mythos 5 lower by about $33 per million blended tokens. Availability is 3 providers versus 2, so concentration risk also matters.
Choose Claude Mythos 5 when coding workflow support, lower input-token cost, and broader provider choice are central to the workload. Choose Claude Mythos Preview when coding workflow support 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. It also helps separate model capability from provider packaging, which can change cost and latency.
FAQ
Which has a larger context window, Claude Mythos 5 or Claude Mythos Preview?
Claude Mythos 5 supports 1m tokens, while Claude Mythos Preview 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 Claude Mythos Preview?
Claude Mythos 5 is cheaper on tracked token pricing. Claude Mythos 5 costs $10/1M input and $50/1M output tokens. Claude Mythos Preview costs $25/1M input and $125/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Mythos 5 or Claude Mythos Preview open source?
Claude Mythos 5 is listed under Proprietary. Claude Mythos Preview is listed under Proprietary. 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 Claude Mythos Preview?
Both Claude Mythos 5 and Claude Mythos Preview expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Claude Mythos 5 or Claude Mythos Preview?
Both Claude Mythos 5 and Claude Mythos Preview expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run Claude Mythos 5 and Claude Mythos Preview?
Claude Mythos 5 is available on Anthropic, AWS Bedrock, and GCP Vertex AI. Claude Mythos Preview is available on Anthropic and Microsoft Foundry. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-06-11. Data sourced from public model cards and provider documentation.