Launched June 9, 2026 as the public, Mythos-class release. Available on the Claude API, Microsoft Foundry, and Google Vertex AI. Free for all users until June 22, 2026. Same underlying model as Claude Mythos 5, with safeguards that block specific high-risk cyber responses.
The nearest models people weigh against it, and what actually separates them.
vs Claude Fable 5.1 — Against Claude Fable 5.1 (Anthropic), Claude Fable 5 lands within a few percent on price. Which one wins depends on whether context depth or latency is your constraint.
vs Claude Opus 4.7 — Against Claude Opus 4.7 (Anthropic), Claude Fable 5 costs about 50% more per token. Claude Opus 4.7 is the one to check first if the price difference matters more than the ceiling.
vs Claude Opus 4.8 — Against Claude Opus 4.8 (Anthropic), Claude Fable 5 costs about 50% more per token. Claude Opus 4.8 is the one to check first if the price difference matters more than the ceiling.
Price History
Claude Fable 5 pricing over time
→0% since Jun 11
56 data points · tracked daily since Jun 11, 2026
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Start using Claude Fable 5
The hardest coding tasks, autonomous multi-step agents, and frontier-grade reasoning. Start free — no card required.
Anthropic's September 1, 2026 frontier release and the new capability ceiling for coding, agents, and scientific work. Base pricing is unchanged at $10/$50, but cache reads dropped 75% to $0.25/1M — roughly 25% cheaper on typical workloads and up to 45% cheaper on agentic ones. 1M context, 128K output, adaptive thinking always on.
Verdict
New frontier leader — better than Fable 5 on every published benchmark, and cheaper to run.
Quality score
98%
Pricing
$10.00/1M in
$50.00/1M out
Speed
Deliberate
2/5 speed
Context
1M tokens
Released September 1, 2026 alongside Claude Mythos 5.1, the first update to the Mythos-class line since Fable 5 on June 9. API ID claude-fable-5-1; generally available on the Claude API, Amazon Bedrock, Google Cloud, and Microsoft Foundry. Published launch numbers (Fable 5.1 / Fable 5 / Opus 5 / GPT-5.6 Sol): Terminal-Bench-Science 0.1 52.6 / 24.7 / 29.0 / 22.4; Terminal-Bench 4.0 55.8 / 42.0 / 52.3 / 37.3; CursorBench 3.2.0 73.4 / 70.5 / 70.0 / 67.2; AutomationBench 31.4 / 17.1 / 26.9 / 19.6; OSWorld 2.0 strict 41.7 / 36.1 / 39.6; Humanity's Last Exam (no tools) 60.9 / 57.8 / 56.6; GDPval-AA v2 1853 / 1723 / 1824 / 1711. GDPval-AA v2 is rescaled from the v1 numbers quoted on the Fable 5 page and is not directly comparable to them.
Anthropic's newest Opus flagship — 69.2% SWE-Bench Pro, 88.6% SWE-Bench Verified, 1890 Arena Elo (121 pts ahead of GPT-5.5), and native parallel subagents. Same $5/$25 price as Opus 4.7.
Verdict
Best value premium coder — frontier-grade at half of Fable 5's price.
Quality score
97%
Pricing
$5.00/1M in
$25.00/1M out
Speed
Deliberate
2/5 speed
Context
1M tokens
Launched May 27, 2026. Available on Claude API, AWS Bedrock, Google Vertex AI, Microsoft Foundry, and GitHub Copilot. Fast mode available at $10/$50 per 1M tokens.
Coding leaderSWE-bench Pro #1Parallel subagentsAgenticLong contextPremiumNew
Best for
Hardest coding tasks, parallel agentic workflows, and high-fidelity vision
Pricing moves, ranking shifts, and capability updates.
New ModelJun 9, 2026
Claude Fable 5 & Mythos 5 launch — new #1 model
Anthropic released Claude Fable 5 and Claude Mythos 5 on June 9, 2026, two months after Mythos rocked Wall Street in private preview. Fable 5 — the generally available, Mythos-class model — scores 80.3% on SWE-Bench Pro, an 11-point leap over Opus 4.8's 69.2% and the largest single-release jump of 2026. It posts 1932 on GDPval-AA, has a 1M-token context, and is free for everyone until June 22. Mythos 5 is the same model with safeguards lifted, restricted to vetted partners. Pricing is $10/$50 per 1M tokens.
Claude Fable 5 now leads all premium coding and research recommendations, replacing Opus 4.8 at the top. At 80.3% SWE-Bench Pro it is the clear benchmark leader. Opus 4.8 remains the best-value premium pick at half the price, and Sonnet 4.6 stays the everyday default.
Claude Fable 5 costs $10 per million input tokens and $50 per million output tokens on the API, with cached input at $1 per million. A month of 10M input and 2M output tokens runs about $200.00 at list price, before any batch or caching discounts.
What is the context window of Claude Fable 5?
Claude Fable 5 has a 1M tokens context window, with up to 128k tokens of output per response. That is the total of prompt plus response the model can hold in one request.
What is the knowledge cutoff of Claude Fable 5?
Claude Fable 5's training data runs through January 31, 2026, and the model was released on July 1, 2026. For anything after that date it needs web search or documents in the prompt.
What is Claude Fable 5 best for?
Claude Fable 5 is best for the hardest coding tasks, autonomous multi-step agents, and frontier-grade reasoning. It is a strong fit when that workflow matters more than the tradeoffs around premium pricing and deliberate speed.
When should I avoid Claude Fable 5?
You are latency- or cost-sensitive, or your tasks don't need frontier-level reasoning — Opus 4.8 at half the price is plenty.
What is a cheaper alternative to Claude Fable 5?
Claude Opus 4.8 (Anthropic) at $5.00/1M/1M input against Claude Fable 5's $10.00/1M/1M — roughly 50% less per token all in. Best value premium coder — frontier-grade at half of Fable 5's price. Compare it first if Claude Fable 5's pricing is the thing stopping you.
What is a faster alternative to Claude Fable 5?
Claude Fable 5.1 — deliberate against Claude Fable 5's deliberate, with 1M tokens of context. Worth the swap when response time is what your users notice rather than the last few points of reasoning depth.
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