🆕 NewJune 9, 2026
Claude Fable 5 released
Anthropic launches its most capable reasoning model with 1M token context and state-of-the-art performance on SWE-Bench. Access was paused June 12 under a US export directive and restored July 1.
Claude Fable 5
🧠 Reasoning🌐 Web Search
Anthropic's most capable model. Built for the hardest reasoning and long autonomous work, at a premium price.
Released June 9, 2026
Pricing
Input tokens$10.00/M
Output tokens$50.00/M
Capacity
Context window1.0M tokens
Max output128K tokens
Capabilities
✓Reasoning & Planning
✓Web Search
✗Open Source
Best Scores
GDPval-AA v21759.6 pts
SWE-bench Verified95.0%
GPQA Diamond92.6%
Terminal-Bench 2.180.5%
SWE-bench Pro80.0%
Best For
💻coding
🔬research
🐛debugging
Benchmark Scores
Specialized Skills
GDPval-AA v2
Real paid work from 44 different jobs, such as law, nursing, and software. Judges compare two answers side by side without knowing which model wrote them, and the winner gains rating points. A typical human expert scores 1000, so a higher number means the work was picked over a human more often.
Provider-reported; no independent run recorded yet.
Software Engineering
SWE-bench Verified
Hands the AI bugs from actual software projects and counts how many it fixes. Like a coding job interview, but with real work.
Provider-reported; no independent run recorded yet.
Terminal-Bench 2.1
Puts the AI in front of a computer terminal and asks it to finish multi-step tasks on its own. Measures how good an "AI agent" it is.
Independently measured by vals.ai.
SWE-bench Pro
The harder version of the coding test. Bigger codebases, trickier bugs. Scores drop for everyone, so the gaps between models become clearer.
Provider-reported; no independent run recorded yet.
Knowledge
GPQA Diamond
PhD-level science questions written so you cannot just Google the answer. Tests whether the model can reason about hard science.
Provider-reported; no independent run recorded yet.
Humanity's Last Exam
PhD-level questions across many subjects. Tests deep reasoning on the hardest questions humans can ask.
Independently measured by Artificial Analysis.
Reasoning
Artificial Analysis Intelligence Index
A frequently refreshed overall score made from nine modern tests: real work, tool use, terminal tasks, science, hard questions, and long-context reasoning. It is a scorecard rather than a percent correct.
Provider-reported; no independent run recorded yet.
Why Choose Claude Fable 5?
Fable 5 is the strongest pure reasoning model on the market. If your task requires solving novel problems, multi-step planning, or deep scientific reasoning, Fable 5 consistently delivers. The 1M token context lets you work with entire codebases or research papers in a single request.
How It Compares
vs GPT-5.6 Sol
Fable 5 excels at complex multi-step reasoning and debugging. Sol is faster for immediate responses.
vs Gemini 3.1 Pro
Fable 5 edges out on reasoning-heavy tasks; Gemini wins on long-context retrieval and speed.