Claude Fable 5.2 vs Opus 5.5: Which to Use in 2026

By PowerfulAI.tools Editorial Team

With Claude Fable 5.2 now out, Claude users have two top-tier models to choose from: Fable 5.2, released on 9 November 2026 (US time), and Claude Opus 5.5, released on 22 September 2026. They are priced very differently and are available on different plans, so it is worth knowing which one fits your work.

Here is how the two compare, based only on Anthropic's official announcements, documentation and pricing.

Image: Anthropic

The quick answer

Anthropic's own advice is that most users should start with Claude Opus 5.5 for daily work and move to Fable for the most open-ended tasks. Opus 5.5 is cheaper and available on more plans. Fable 5.2 is Anthropic's model for the most difficult technical work.

Price

For developers on the Claude API, Anthropic's official prices (US dollars, per million tokens) are:

• Fable 5.2: US$8 input and US$40 output. Fast mode is US$16 input and US$80 output.
• Opus 5.5: US$4 input and US$20 output. Fast mode is US$8 input and US$40 output.

In other words, Fable 5.2 costs twice as much as Opus 5.5 at standard rates.

Which Claude plans include each model

• Free: neither model. Anthropic's pricing page lists Sonnet and Haiku for Free users.
• Pro (US$20 a month): Opus 5.5 is included. Fable runs on pay-as-you-go usage credits, apart from a launch week that ends on 16 November 2026 (US Pacific time).
• Max (from US$100 a month) and Ultra (US$200 a month): both are included. Fable can use up to 50% of your weekly limit.
• Team: standard seats include Opus, with Fable on usage credits. Premium seats include Fable for up to 50% of weekly limits.

Anthropic also notes that Fable uses your weekly limit faster than other models.

Performance

Anthropic's announcement for Fable 5.2 reports that it scored 49.1% on the FrontierCode 2.0 coding benchmark at its highest effort setting, compared with 45.5% for Opus 5.5. Anthropic notes these are results from its own internal runs.

Anthropic describes Fable 5.2 as designed "to tackle the most daunting technical challenges", with improvements in coding, reasoning and vision. Its pre-release examples include difficult software migrations and long, multi-agent projects.

When Anthropic launched Opus 5.5, it said Opus 5.5 "performs at the level of Claude Fable 5.1 on most work", referring to the previous Fable version. Anthropic also said Opus 5.5 is more than 30% faster at generating output than Opus 5.

Specs side by side

According to Anthropic's developer documentation, both models have:

• A 1 million token context window.
• Up to 128,000 tokens of output.
• Availability on the Claude Platform, Amazon Web Services, Google Cloud and Microsoft's cloud.

The model IDs are claude-fable-5-2 and claude-opus-5-5.

Working together

You do not always have to pick one. Anthropic says Fable 5.2 can act as an "Advisor", where Haiku, Sonnet or Opus models consult it on harder problems, or as an "Orchestrator" that hands simpler tasks to smaller models.

Which should you use?

• Choose Opus 5.5 for everyday writing, research, analysis and most coding. It is included on Pro, costs half as much on the API and, by Anthropic's account, is close to the previous Fable on most work.
• Choose Fable 5.2 for the hardest technical jobs, such as large coding projects or complex, open-ended problems where the extra capability is worth the higher cost or faster use of your limits.

If you are on Pro, the Fable launch week until 16 November is a good chance to compare the two on your own tasks before Fable moves to usage credits.

How we checked

We checked every detail on 10 November 2026 against Anthropic's official sources: Introducing Claude Fable 5.2 and Claude Mythos 5.2, Introducing Claude Opus 5.5, the Claude Opus 5.5 developer documentation, the Claude plans and pricing page, and the help centre articles Claude Fable models on your plan and Claude Fable 5.2 launch offers.