Claude Mythos Preview
Claude Mythos Preview is worth evaluating for coding, rag, and agents when its provider route and context window match the workload.
Use it for
- Teams evaluating coding, rag, and agents
- Workloads that can use a 1m context window
- Buyers comparing 2 tracked provider routes
Do not use it for
- Workloads where another current model has stronger sourced task evidence
- Family
- Claude Mythos
- Released
- 2026-05-01
- Context
- 1m
- Architecture
- Decoder Only
- Knowledge cutoff
- 2025-12
- Specialization
- security
- Openness
- Proprietary
- License
- ProprietaryCommercial use with conditions
- 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.
Claude Mythos Preview is a proprietary model in the Claude Mythos family. The structured metadata tracks a 1m-token context window, multimodal input, reasoning, function calling, tool use, structured outputs, and code execution. This page tracks provider routes through Anthropic and Microsoft Foundry, with the cheapest tracked route listed at $25 input and $125 output per 1M tokens. Headline tracked benchmarks include SWE-bench Verified 93.9, τ-bench 89.2, and Google-Proof Q&A 94.6.
Top use-case fit: coding, agents, and build tasks
Coding
Q/$ D1 relevant benchmark in the decision map.
RAG
Included by capability and metadata signals in the decision map.
Agents
Q/$ D2 relevant benchmarks in the decision map.
Provider price ladder
Compare all 2Compare API pricing across 2 providers 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 | - | - | ServerlessPartial |
Available via routers & gateways(15)
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.
Kong AI Gateway
GatewayMulti-LLM AI gateway built on Kong Gateway 3.x, adding semantic routing, load balancing, guardrails, and MCP traffic analytics as plugins over Kong's existing API management platform.
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.
Martian
RouterAI-powered LLM router that analyzes each prompt in real-time to select the optimal model, targeting 20–97% cost reduction while maintaining quality; San Francisco startup reportedly nearing $1.3B valuation.
Capabilities
Benchmark peer barsfor Coding
Benchmark scores(3)
| Benchmark | Score | Version | Source |
|---|---|---|---|
| SWE-bench Verified | 93.9 | SWE-bench Verified | https://anthropic.com/glasswing |
| τ-bench | 89.2 | τ-bench | https://benchlm.ai/benchmarks/tauBench |
| Google-Proof Q&A | 94.6 | diamond | https://epoch.ai/benchmarks/gpqa-diamond; https://intuitionlabs.ai/articles/gpqa-diamond-ai-benchmark |
Migration checks
No linked migration route is available for this model yet.
Rankings & picks(2)
Comparison and alternatives
Browse all comparisons →Show all 19 popular comparisonssorted by 7-day search impressions
Cheapest of 2 routes · Anthropic