One agent session
1M input tokens and 100K output tokens, no caching.
- Input1M x $10 = $10.00
- Output0.1M x $50 = $5.00
$15.00per session
Anthropic - Closed weights
Claude Fable 5 pricing and specs
Claude Fable 5 is a closed-weights model from Anthropic that costs $10 per 1M input tokens and $50 per 1M output tokens on the first-party API, with a 1M-token context window.
Last verified from platform.claude.com. All sources
- Input / 1M
- $10
- Output / 1M
- $50
- Context
- 1M tokens
- Weights
- Closed
Pricing per 1M tokens
| Item | Price / 1M tokens |
|---|---|
| Input | $10 |
| Output | $50 |
| Cache read | $1 |
| Cache write (5 minutes) | $12.50 |
| Cache write (1 hour) | $20 |
| Batch inputBatch requests | $5 |
| Batch outputBatch requests | $25 |
Note: Legacy model, still sold. Standard 0.1x cache read multiplier (Fable 5.1 cuts cache reads to $0.25). Retirement not sooner than 2027-06-09 per the deprecations page.
Specs
- Context window
- 1,000,000 tokens
- Max output
- 128,000 tokens
- Release date
- Provider
- Anthropic
- API model id
claude-fable-5- Vercel AI Gateway id
anthropic/claude-fable-5- Weights
- Closed weights
What Claude Fable 5 costs in practice
Worked from the standard list rates above, with the math shown so you can swap in your own token counts.
A chat app
10,000 requests a day at 2K input and 500 output tokens each.
- Input20M x $10 = $200.00
- Output5M x $50 = $250.00
$450.00per day
$13,500.00 per 30-day month
The same session at a 90% cache hit
90% of the input is read from the prompt cache. The one-time cache write premium is not included.
- Cached input0.9M x $1 = $0.90
- Uncached input0.1M x $10 = $1.00
- Output0.1M x $50 = $5.00
$6.90per session
Compare with
| Model | Input / 1M | Output / 1M |
|---|---|---|
| Claude Fable 5 (this page) | $10 | $50 |
| Claude Fable 5.1Anthropic | $10 | $50 |
| Claude Mythos 5Anthropic | $10 | $50 |
| Claude Mythos 5.1Anthropic | $10 | $50 |
| GPT-6 AstraOpenAI | $10 | $50 |
| Claude Opus 4.5Anthropic | $5 | $25 |
| Claude Opus 4.6Anthropic | $5 | $25 |
| Claude Opus 4.7Anthropic | $5 | $25 |
Compare
Side-by-side pages with both models' prices, specs, cost examples and like-for-like benchmark rows.
Related reading
- Anthropic Cuts Fable 5 Biology Fallbacks by 85%: What the Safeguard Tuning Means for DevelopersAnthropic retuned Claude Fable 5 biology safeguards, cutting biology fallbacks about 85%. What changed and what still routes to Opus 5.
- Fable 5 Effort Levels vs Switching Models: When to Dial and When to ChangeFable 5 effort levels vs switching models: effort spends more of one model's ceiling, a model switch buys a new one. When to move each dial.
- The New Rules of Context Engineering for Claude 5 Models: A Developer GuideAnthropic removed over 80% of Claude Code's system prompt for Claude 5 models. Here is how the rules changed and what it means for your CLAUDE.md files, skills, and system prompts.
- Claude Opus 5 vs Opus 4.8 vs Fable 5: Benchmark Comparison (July 2026)Claude Opus 5 launched July 24, 2026 at $5/$25 per MTok - matching Opus 4.8 pricing while delivering near-Fable 5 intelligence. Full benchmark comparison across 7 evals, pricing breakdown, and decision guide.
- Terence Tao Digests the Jacobian Conjecture Counterexample: How Claude Fable 5 Broke an 87-Year-Old Math ProblemClaude Fable 5 found a counterexample to the 87-year-old Jacobian conjecture, and Terence Tao worked through the math. How it works and what HN is saying.
- Kimi K3 Drops: Moonshot's 2.8T Parameter Frontier Model Takes on GPT-5.6 and Fable 5Kimi K3 is Moonshot's 2.8T-parameter model with a 1M-token context and Delta Attention. Pricing, HN reactions and where it fits among frontier models.
FAQ
How much does Claude Fable 5 cost per million tokens?
Claude Fable 5 costs $10 per 1M input tokens and $50 per 1M output tokens on Anthropic's first-party API, per platform.claude.com on October 17, 2026. Per 1M tokens, cache reads cost $1, and the batch rate is $5 input and $25 output.
What is Claude Fable 5's context window?
Claude Fable 5 has a 1,000,000-token context window and returns up to 128,000 output tokens per response.
Are Claude Fable 5's weights open?
No. Claude Fable 5 is a closed-weights model. You call it through Anthropic's API as claude-fable-5 or through Vercel AI Gateway as anthropic/claude-fable-5.
When was Claude Fable 5 released?
Anthropic released Claude Fable 5 on June 9, 2026.
Sources
Last verified from platform.claude.com.
- https://platform.claude.com/docs/en/about-claude/pricing
- https://platform.claude.com/docs/en/models/fable-5/overview
- https://platform.claude.com/docs/en/about-claude/models/overview
- https://platform.claude.com/docs/en/release-notes/overview
- https://platform.claude.com/docs/en/about-claude/model-deprecations
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