Claude Fable 5 vs Claude Sonnet 5.5

Best cell per row highlighted. Null means undisclosed — never counted as zero.

Anthropic
Claude Fable 5GA
9.5
AI Panel
Anthropic
Claude Sonnet 5.5GA
9.3
AI Panel

Identity & lifecycle

ProviderAnthropicAnthropic
Family / tierClaude 5 · FableClaude 5 · Sonnet
StatusGAGA
Released2026-06-092026-09-28
Knowledge cutoff2026-012026-06

Architecture & context

Context window1M1M
Max output tokens128K128K
Input modalitiestext, image, filetext, image
Reasoning modealwaysoptional
Open weightsNoNo

Pricing (per Mtok)

Input$10$2
Output$50$10
Cached input$1$0.2
Batch input$5$1
Free tierNoYes

Speed

Output speed (tok/s)—97.6
Time to first token (s)—12.7
Latency tierslowfast

Trust & deployment

Trains on inputsNoNo
LicenseProprietaryProprietary
CloudsBedrock, Vertex AI, Azure AI FoundryBedrock, Vertex AI, Azure AI Foundry
ComplianceSOC2, HIPAA, GDPR, ISO27001SOC2, HIPAA, ISO27001, ISO42001

AI Panel scoring

Unified score9.59.3
Decision Maker9.59.5
Domain Strategist9.59.2
Finance Lead78.8
Domain Practitioner9.59.3
Power User99.2
Skeptic7.58
Value score6.59.2

Benchmarks

SWE-bench Verified95—
Terminal-Bench88—
Humanity's Last Exam—56.9
LMArena Elo15061471
LMArena Coding Elo15521536
Artificial Analysis Index—56

Scores link to their sources. Missing cells mean the vendor hasn't disclosed a result — honesty over padding.