Claude (Fable 5.1 / Opus 5.5)
The Coding & Writing Champion
Claude Fable 5.1 (September 1, 2026) is Anthropic's frontier model for demanding reasoning and long-horizon agentic work, at $10/M input and $50/M output, with cache reads cut 75% (from $1/M to $0.25/M). It succeeds Fable 5 (June 9, 2026), now a legacy model. Opus 5.5 (September 22, 2026) is the new Opus flagship, 40% cheaper and 30%+ faster than Opus 5, with stronger agentic coding and reasoning; Opus 5 (July 24, 2026) is now a legacy model, still available. Fable 5.1 uses usage credits on Pro (Max includes up to 50% of weekly limits); Opus 5.5 is the standard model on all Pro and Max subscriptions.
✓Strengths
- •Fable 5.1: Anthropic's frontier model for demanding reasoning and long-horizon agentic work
- •Fable 5.1 (Sep 1, 2026): cache reads cut 75% to $0.25/M, big savings for high-cache workflows
- •Opus 5.5 (Sep 22, 2026): new Opus flagship, 40% cheaper, 30%+ faster, stronger agentic coding than Opus 5
- •1M-token context window as standard
- •Extended Thinking mode for complex reasoning
- •Claude Code is the standard in many engineering teams
- •Best long-context retention in reviews
- •Memory across chat and Cowork with editable Topics (August 25, 2026)
⚠Considerations
- •Fable 5.1 needs usage credits on Pro (Max includes up to 50% of weekly limits), billed at $10/$50 per M tokens input/output
- •Session and weekly usage caps on paid tiers (Opus 5.5)
- •No native video or audio generation
- •More minimal interface than ChatGPT
Pricing & Details
Pricing
$20/month (Pro), $100-200/month (Max); Fable 5.1 via usage credits on Pro (Max includes up to 50% of weekly limits) at $10/$50 per M tokens
Free Option
Yes (Claude Sonnet 5.5, usage limits reset every five hours)
Best For
Production code, long-form writing, analysis, complex reasoning tasks
Related guides & comparisons
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