SSyncDev

AI model comparison

Claude Fable 5.1 vs Claude Opus 5.5

Compare pricing, context limits, supported inputs and deployment options to choose a model for your workflow.

Claude Fable 5.1 and Claude Opus 5.5 are candidates for coding, reasoning and professional workflows. Their recorded context limits are the same (1,000,000 tokens), so context capacity alone will not select a winner.

Coding and document work need a checkable deliverable: a patch that passes required checks, or an answer supported by the supplied material. A broader specification sheet does not establish better results for your repository or documents.

The prices below belong to the recorded API routes. Processing tiers, long-context rules, cache behavior and tool charges can change the cost of a complete task.

Side-by-sideCapabilities and practical differences

Anthropic

Claude Fable 5.1

Claude Fable 5.1 is an Anthropic language model that accepts text and images and returns text.

Context
1M
Max output
128K
Input / 1M tokens
$10.00
Output / 1M tokens
$50.00

Accepts

  • Text input
  • Image input

Produces

  • Text output
Full model profileplatform.claude.com ↗
VS

Anthropic

Claude Opus 5.5

Claude Opus 5.5 is an Anthropic language model that accepts text and images and returns text.

Context
1M
Max output
128K
Input / 1M tokens
$4.00
Output / 1M tokens
$20.00

Accepts

  • Text input
  • Image input

Produces

  • Text output
Full model profileplatform.claude.com ↗

At a glance

Key differences

Compare the available figures below, then try both models on the work you need to do.

Claude Opus 5.5

  • Input price: $4.00
  • Output price: $20.00

Context capacity

Higher listed limit

Claude Fable 5.1:1M

Claude Opus 5.5:1M

Same value

Maximum output

Higher listed limit

Claude Fable 5.1:128K

Claude Opus 5.5:128K

Same value

Input price

Lower listed token rate

Claude Fable 5.1:$10.00

Claude Opus 5.5:$4.00

Claude Opus 5.5

Output price

Lower listed token rate

Claude Fable 5.1:$50.00

Claude Opus 5.5:$20.00

Claude Opus 5.5

Specifications

Pricing, limits and capabilities

Specifications for Claude Fable 5.1 and Claude Opus 5.5. Higher limits and lower prices describe these figures only.
SpecificationClaude Fable 5.1Claude Opus 5.5
ProviderAnthropicAnthropic
Listed pricing routeAnthropicAnthropic
Model familyClaude 5Claude 5
Accepted inputstext, imagetext, image
Produced outputstexttext
Context window1M1M
Max output128K128K
Input price / 1M$10.00$4.00Lower
Output price / 1M$50.00$20.00Lower
Reasoning modeDocumentedDocumented
Tool callingDocumentedDocumented
Image inputDocumentedDocumented
Audio inputNot documentedNot documented
Structured outputDocumentedDocumented
LicenseProvider termsProvider terms

Workload guidance

Which model should you choose?

Decide using accepted tasks

Run the same representative jobs with identical tool access and an explicit effort setting. Inspect incomplete work and failed tool calls alongside successful outputs. Compare total billed usage, time to a verified deliverable and the corrections a person must make.

If the lower-cost candidate passes your acceptance criteria, use it for that workload. Move difficult cases to the more expensive route when the evaluation demonstrates a useful improvement. Coding and document work need a checkable deliverable: a patch that passes required checks, or an answer supported by the supplied material. No universal winner is inferred from a specification score.

Documentation and model profiles

Explore each model’s features, API requirements and licence terms in the sources below.

Questions people ask

It brings together documented inputs and outputs, token limits, deployment terms and available pricing. When both models have source-linked, verified results on a shared benchmark, those results are shown with their individual sources. The comparison is a starting point for evaluating your own workload.

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