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 shared | 0 shared |
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 route 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 |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| 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 |
| JSON / 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 scores are currently available for this pair.
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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.