Claude Mythos Preview
- Family
- Claude Mythos
- Released
- 2026-05-01
- Context
- 1M
- Architecture
- Decoder Only
- Knowledge cutoff
- 2025-12
- Specialization
- security
- Openness
- Proprietary
- License
- ProprietaryRestricted
- Weights
- Not released
- Code
- Unknown
- Training
- Pretrained
Cheapest of 2 routes · Anthropic
About
Anthropic's cybersecurity-focused frontier model, offered as an invitation-only research preview under Project Glasswing. Succeeded by Claude Mythos 5 (API ID: claude-mythos-5) as of June 9, 2026. Anthropic has indicated that Claude Mythos Preview will be retired after Claude Mythos 5 becomes available; no formal retirement date was published as of 2026-06-09. For current access and the migration path, see the Anthropic migration guide.
Providers(2)
Compare all 2Compare API pricing across 2 tracked provider routes for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Route |
|---|---|---|---|
| Anthropic | $25.00 | $125.00 | Serverless |
| Microsoft Foundry | Contact sales | Contact sales | Serverless Scheduled retirement: April 2, 2027 |
Available via routers & gateways(15)
LiteLLM
GatewayOpen-source Python SDK and proxy server that unifies 100+ LLM APIs behind a single OpenAI-compatible interface, with load balancing, cost tracking, and configurable failover.
OpenRouter
HybridUnified hybrid gateway to 400+ models from 60+ providers via a single OpenAI-compatible API, with optional auto-routing that selects the best model per prompt.
Portkey
GatewayProduction AI gateway routing to 1,600+ LLMs with failover, load balancing, semantic caching, and guardrails; Apache 2.0 core is fully self-hostable with the complete feature set.
AIRouter
RouterCommercial LLM router that analyzes incoming requests and routes to the optimal model for cost/quality/latency via a drop-in OpenAI-compatible API, with a privacy-preserving embedding mode that avoids sending prompt content.
Azure AI Foundry Model Router
RouterMicrosoft Azure AI Foundry's native model router that uses a trained ML model to route each prompt in real time to the optimal Azure-hosted model, with Balanced/Cost/Quality mode selection and automatic failover.
Helicone
GatewayObservability-first AI gateway with routing, caching, rate limiting, and request tracing; Apache 2.0 open-source core with a managed hosted tier for logging and analytics.
Capabilities
Benchmark peer barsfor Coding
Benchmark scores(3)
| Benchmark | Score | Version | Evaluation | Source |
|---|---|---|---|---|
| 93.9 | SWE-bench VerifiedObserved 2026-05-01 | — | ||
| 89.2 | τ-benchObserved 2026-05-05 | — | ||
| 94.6 | diamondObserved 2026-05-05 | — |
Migration checks
No linked migration route is available for this model yet.
Rankings & picks(1)
Compare Claude Mythos Preview with other models
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- Claude Mythos Preview vs Grok 4.3315
- Claude Mythos Preview vs Doubao Seed 2.0 Code191
- Claude Mythos Preview vs GPT-5.5 Pro189
- Claude Mythos Preview vs DeepSeek V4 Flash166
Comparison and alternatives
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Cheapest of 2 routes · Anthropic