Anthropic: Claude Fable 5.1 (batch) API Pricing
Anthropic: Claude Fable 5.1 (batch) costs $5.00 per 1M input tokens and $25.00 per 1M output tokens (cache reads: $0.125). Context window: 1M. Prices verified 2026-10-21 · source
Alternatives to consider
96% cheaper with nearly identical quality (52 vs 53.4)
Cheapest anthropic model — 99% less per month
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From our own daily snapshot archive — independent of provider announcements.
Intelligence measures reasoning/knowledge/coding benchmarks. A high score with a low blended price = value pick; check the value chart to see where this model lands.
Token economics
| Token type | Price | vs base input |
|---|---|---|
| Standard input | $5.00 | — |
| Cache read | $0.125 | −98% |
| Cache write (5m) | $6.25 | +25% |
| Cache write (1h TTL) | $10.00 | +100% |
| Output | $25.00 | — |
| Web search tool | $10/1k searches | — |
Prompt caching stores repeated context server-side: reads cost far less, but writes carry a one-time premium.
Higher effort = deeper thinking = more reasoning tokens billed as output.
What would Anthropic: Claude Fable 5.1 (batch) cost you per month?
| Workload | Requests/mo | Avg tokens (in/out) | Est. monthly cost |
|---|---|---|---|
| Light chatbot | 10,000 | 800 / 400 | $140.00 |
| Coding agent | 5,000 | 8,000 / 2,000 | $450.00 |
| RAG pipeline | 30,000 | 4,000 / 500 | $975.00 |
| Doc summarizer | 2,000 | 20,000 / 1,000 | $250.00 |
Estimates use list prices without prompt caching. Caching can cut input cost by up to 90% on repeated context.
About Anthropic: Claude Fable 5.1 (batch)
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
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Frequently asked questions
How much does Anthropic: Claude Fable 5.1 (batch) cost?
Anthropic: Claude Fable 5.1 (batch) costs $5.00 per 1M input tokens and $25.00 per 1M output tokens; cached input tokens cost $0.125 per 1M. Verified 2026-10-21 — provider source.
What is the context window?
1M tokens, with up to 128K output tokens per response. That's roughly 1250 pages of text in a single request.
Does it support prompt caching?
Yes — cached input is $0.125/1M, about 98% cheaper than standard input. Agents and RAG workloads with repeated context benefit most.
What's a cheaper alternative?
ScaleDown: Summarize saves about 99% on a typical workload with comparable quality.
Official resources
- Anthropic: Claude Fable 5.1 (batch) on OpenRouter — live endpoint, pricing source of record.
- Artificial Analysis leaderboard → — independent intelligence and performance rankings.
- Anthropic model docs → — first-party model specifications and limits.
- LMArena leaderboard → — independent human-preference rankings.
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