# Claude Mythos 5 Review & Benchmarks (2026): Price, Context, Specs | Alher Tech

> Claude Mythos 5 by Anthropic: benchmarks, pricing, context window, strengths and use cases. Data from official benchmark sources.

- Canonical page: https://alhertech.com/en/ai-comparison/claude-mythos-5/
- Site: Alher Tech (custom software, AI agents and SEO engineering, https://alhertech.com/)
- Contact: https://alhertech.com/en/contact/

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Last updated: June 10, 2026

## Specs

- **Vendor**: Anthropic
- **Released**: June 9, 2026
- **Context window**: 1M tokens
- **Input**: $10 / M tokens
- **Output**: $50 / M tokens

## Benchmarks

- **mmlu**: 95.1
- **gpqa**: 92
- **humanEval**: 98
- **arenaElo**: 1493
- **sweBench**: 78
- **sweBenchPro**: 73
- **liveCodeBench**: 85
- **aiderPolyglot**: 87
- **terminalBench**: 53
- **mmluPro**: 89.5
- **hle**: 31
- **aime**: 94.5
- **math500**: 98.8
- **mmmu**: 83.5

## Strengths

- Same frontier capabilities, pricing and API surface as Claude Fable 5, Anthropic's most capable model
- 1M-token context window (the default) with 128K max output and always-on protected thinking
- Delivered through Project Glasswing, succeeding the invitation-only Claude Mythos Preview

## Weaknesses

- Access limited to Project Glasswing participants: there is no general self-serve API
- Same premium pricing ($10 / $50 per M tokens) and ~30% heavier new tokenizer as Fable 5
- Requires 30-day data retention (not available under zero-data-retention); safety classifiers may refuse some bio/cyber-adjacent requests

## Best for

- Project Glasswing partners that need the most capable Claude available
- Frontier reasoning, research and long-horizon autonomous agents
- Workloads that justify gated frontier access over the generally-available Fable 5

[Compare with other AI models](https://alhertech.com/en/ai-comparison/)