Claude Fable 5.1 pricing
Claude Fable 5.1 API cost from Anthropic — $10.00 per 1M input tokens and $50.00 per 1M output tokens. Standard rates across 1M context; cache writes billed separately. Estimate your real monthly bill below, then compare it against every other model.
Flagship 1M context · all prices USD per 1M tokens, this price verified 2026-10-10.
Cache writes: $12.50 / 1M tokens. Batch: 50% of Standard.
Astra vs Fable 5.1 costs
Both models charge $10 input and $50 output per million tokens at Standard rates. Fable 5.1 reads cached tokens at $0.25 per million; Astra charges $1 before its long-context multiplier. Compare cache-write budgets and the 272K prompt boundary →
Fable 5.1 keeps Standard rates across its 1M context. Cache writes cost $12.50 per million for a 5-minute lifetime or $20 for 1-hour storage. Batch input/output are $5/$25; US-only inference adds 10%. This model is separate from Fable 5. The estimator below uses existing cache reads when caching is selected, and excludes write charges.
Claude Fable 5.1 capabilities & limits
Representative specs for this tier — confirm exact limits in the Anthropic docs.
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Call Claude Fable 5.1 from your code
The exact model string and endpoint to use. Uses the Anthropic API format.
claude-fable-5-1https://api.anthropic.com/v1ANTHROPIC_API_KEYcurl https://api.anthropic.com/v1/messages \
-H "x-api-key: $ANTHROPIC_API_KEY" \
-H "anthropic-version: 2023-06-01" \
-H "content-type: application/json" \
-d '{
"model": "claude-fable-5-1",
"max_tokens": 1024,
"messages": [{"role": "user", "content": "Hello"}]
}'Model strings follow each provider's naming convention; confirm the current id in the Anthropic docs before relying on it.
What a Claude Fable 5.1 API call actually costs
Blended input + output cost at Claude Fable 5.1's list rates — useful yardsticks before you commit to volume.
Claude Fable 5.1 cost calculator
Enter your monthly volume to estimate the Claude Fable 5.1 bill. Runs entirely in your browser.
Peak/off-peak and long-context pricing are applied automatically where published. Cache-write, Batch/Flex and Fast-mode adjustments are not included. For the multi-model breakdown with the same exclusions, use the cost calculator.
Anthropic models — Claude Fable 5.1 in context
How Claude Fable 5.1 prices against its siblings. Cheapest reference cost first.
| Model | Input /1M | Output /1M | Cost / call* | Context | Type |
|---|---|---|---|---|---|
| Claude Haiku 5.5 Prompts up to 100K; above 100K, all token rates are 5× higher | $0.100 | $0.500 | $0.0006 | 1M | Fast / cheap |
| Claude Haiku 4.5 Fastest, near-frontier | $1.00 | $5.00 | $0.0060 | 200K | Fast / cheap |
| Claude Sonnet 5.5 Standard rates across 1M context; 5-minute and 1-hour cache writes billed separately | $2.00 | $10.00 | $0.012 | 1M | Balanced |
| Claude Sonnet 4.6 Best speed/intelligence; caching cuts input ~90% | $3.00 | $15.00 | $0.018 | 1M | Balanced |
| Claude Opus 5.5 Standard rates across 1M context; Fast costs 2× and cannot combine with Batch | $4.00 | $20.00 | $0.024 | 1M | Flagship |
| Claude Opus 4.8 Top Opus reasoning/agentic | $5.00 | $25.00 | $0.030 | 1M | Flagship |
| Claude Fable 5.1 Standard rates across 1M context; cache writes billed separately | $10.00 | $50.00 | $0.060 | 1M | Flagship |
| Claude Fable 5 Most capable widely released | $10.00 | $50.00 | $0.060 | 1M | Flagship |
*Reference cost of one call with 1,000 input + 1,000 output tokens — a neutral yardstick. Use the calculator for your real usage. Cheapest row highlighted.
How Claude Fable 5.1 pricing works
Claude Fable 5.1 is billed per token: a lower input price of $10.00 per million tokens for everything you send, and a higher output price of $50.00 per million for everything the model generates. To turn that into a real Claude Fable 5.1 bill, multiply by your monthly request volume and average prompt/response length — the calculator above does exactly that.
Prompt caching is the biggest lever on your Claude Fable 5.1 cost: cached input tokens bill at just $0.250 per million — about 98% cheaper. If you reuse a long system prompt or context across calls, caching can dramatically cut the input portion of your bill.
List prices move fast — always confirm the current numbers on the official Anthropic pricing page before relying on them for budgeting.
Claude Fable 5.1 pricing FAQ
How much does the Claude Fable 5.1 API cost?
Claude Fable 5.1 costs $10.00 per 1M input tokens and $50.00 per 1M output tokens, with cached input at $0.250 per 1M (about 98% off). A typical 3K-input / 500-output call at the displayed rate works out to about $0.055.
What is Claude Fable 5.1's context window?
Claude Fable 5.1 has a 1M-token context window. Standard uncached input is $10.00 per 1M tokens.
What does Fable 5.1 prompt caching cost?
Per million tokens, reads cost $0.25, 5-minute writes cost $12.50 and 1-hour writes cost $20. The minimum cacheable prefix is 512 tokens. Count writes separately from reads; these rates apply throughout the 1M context window.
Is there a cheaper alternative to Claude Fable 5.1?
In the same flagship tier, MiniMax-M3 (MiniMax) is cheaper at $0.300 in / $1.20 out. For the 1K-input / 1K-output reference workload, the lowest-cost model tracked in this catalog is Gemini 1.5 Flash-8B.