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Anthropic

Claude Fable 5.1

AClosed

Anthropic's September 2026 update; Fable 5 delivers more than 2x the performance of Fable 5 (Frontier-Bench). Supports a new "adaptive reasoning" mode for handling complex multi-step tasks. The default model for Claude Max/Team Premium.

API Pricing

Input

$10

Output

$50

Cached input

$0.25

Peak hours

—

USD / 1M tokens

※ Same price as Fable 5; Adaptive Reasoning mode available; Batch 50% off; cache hits $0.25/MTok (90% savings), cache write $12.5/MTok

Price sourceanthropic.com ↗

No price change in the last two snapshots

Price history

12 snapshots · 2026-04-28 → 2026-08-17

Current: $3.971Period low: $2.515 (2026-04-28)Period high: $3.971 (2026-07-01)First tracked: $2.515 (2026-04-28)

Specifications

Context window
1M Tokens
Max output
128K Tokens
License
Closed

Overall score

Total

60.3

Rank

#10

Tier

A

Data confidence

85%

Capability94
Scale35
Value28
Context60.5
Ecosystem21
Freshness77.8

Capabilities & use cases

Best for

  • Large-scale codebase migration and refactoring
  • Long-running autonomous agents
  • Complex multi-step reasoning
  • Financial modeling
  • Visual multimodal analysis

Official links

Website ↗API platform ↗Pricing page ↗Open in comparator ↗

Same vendor

Claude Sonnet 5.5Claude Haiku 5.5Claude Opus 5.5Claude Opus 4.8

Similar price

GPT-6 Astra $50GPT-5.5 $30Kimi K3 $15GPT-5.4 $15GPT-5.2 $14GPT-5.6 Terra $12

FAQ

What does Claude Fable 5.1 cost?
Claude Fable 5.1 is priced at $50 output and $10 input (USD per 1M tokens)
How large is the context window of Claude Fable 5.1?
Claude Fable 5.1 has a 1M Tokens context window with up to 128K Tokens output.
Where can I access Claude Fable 5.1?
Official channels: Website and API platform.

Data is refreshed daily and cross-checked against two independent sources; please confirm pricing and specs on the vendor page.