Anthropic
Anthropic Claude model for long-running agentic coding and knowledge work.
1M ctxUSD 4 / 1M input tok; USD 20 / 1M output tok
Introducing Claude Fable 5AnthropicReleased June 9, 2026
Claude Fable 5
Fifth-generation Claude architecture engineered specifically for multi-hour autonomous agent workflows and deep research.
reasoning-llmProprietary API$10.00 / 1M tok (Long-Horizon Agents)Context: 1M (1,000,000 tokens)Arena ELO: 1530
Technical Specifications
Architecture Type
Fifth-Generation Long-Horizon Agent Architecture
Total Parameters
Fifth-Gen Scale
Context Window
1M (1,000,000 tokens)
Max Output Tokens
128K (128,000 tokens)
Knowledge Cutoff
April 2026
Supported Modalities
text, code, vision, reasoning
License & Access
Anthropic Commercial Terms
Benchmark Evaluations
Mmlu Pro
91.8
Gpqa Diamond
86.2
Swe Bench Verified
84.9
Chatbot Arena ELO
1530
Deep Architectural Overview
Claude Fable 5 introduced dedicated support for sessions that run for hours. Built for multi-step research, end-to-end document/spreadsheet/deck compilation, and complex multi-agent cooperation.
Strengths & Considerations
Core Strengths
- Engineered specifically for multi-hour autonomous agent sessions
- 1M context retention without mid-conversation degradation
- 84.9% SWE-bench Verified coding capability
Known Limitations
- Premium pricing ($10/$50) targeted at mission-critical agent workloads; succeeded by Fable 5.1
Token & API Pricing
Input Tokens (1M)$10.00
Output Tokens (1M)$50.00
Cached Input (1M)$1.0000
Batch API Discount50% Off Standard
Pricing is verified directly against Anthropic's developer documentation and API rate sheets.
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