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Claude Fable 5.1 vs Claude Opus 5.5

Price, context, inputs and filters. No benchmarks theatre.

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Claude Opus 5.5 costs 2.5× less per message.

Both hold the same amount of context.

Claude Fable 5.1Anthropic
MainstreamChat with Claude Fable 5.1
Claude Opus 5.5Anthropic
MainstreamChat with Claude Opus 5.5
Made by
Anthropic
Anthropic
Content tier
Mainstream
Mainstream
Intelligence
Brilliant
Brilliant
Price per message
~30.55 credits≈ 3 messages for 1 €
~12.22 credits≈ 8 messages for 1 €
Context window
1M tokens≈ 1,538 pages of text in one go
1M tokens≈ 1,538 pages of text in one go
Reads
Text, Images
Text, Images
Writes
Text
Text
Tool use
Yes - search, memory, code and more
Yes - search, memory, code and more
Served via
OpenRouter, Unbottled AI
OpenRouter, Unbottled AI
Status
Legacy
Current

A typical message: 16K tokens in, 1.5K out. Short replies cost less. 1 credit = 0.01 €.

Claude Fable 5.1 detailsClaude Opus 5.5 details