Claude Opus 4.8 vs GPT-5.5 vs Gemini 3.1 Pro

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

Anthropic
Claude Opus 4.8GA
9.2
AI Panel
OpenAI
GPT-5.5GA
8.7
AI Panel
Google
Gemini 3.1 Propreview
8.7
AI Panel

Identity & lifecycle

ProviderAnthropicOpenAIGoogle
Family / tierClaude 4 · OpusGPT-5 · ProGemini 3 · Pro
StatusGAGApreview
Released2026-05-282026-04-242026-02-19
Knowledge cutoff2026-012025-122025-01

Architecture & context

Context window1M1.1M1.0M
Max output tokens128K128K66K
Input modalitiestext, imagetext, imagetext, image, audio, video
Reasoning modealwaysoptionaloptional
Open weightsNoNoNo

Pricing (per Mtok)

Input$5$5$2
Output$25$30$12
Cached input$0.5$0.5$0.2
Batch input$2.5$2.5$1
Free tierNoNoNo

Speed

Output speed (tok/s)6068.7142.7
Time to first token (s)0.56430.78
Latency tiermediumslowslow

Trust & deployment

Trains on inputsNoNoNo
LicenseProprietaryProprietaryProprietary
CloudsBedrock, Vertex AI, Azure AI FoundryAzure OpenAI, Azure AI FoundryVertex AI, GCP
ComplianceSOC2, HIPAA, GDPR, ISO27001SOC2, GDPR, CCPA, HIPAASOC2, HIPAA, GDPR, ISO27001, FedRAMP, CCPA

AI Panel scoring

Unified score9.28.78.7
Decision Maker999
Domain Strategist98.89
Finance Lead8.578.5
Domain Practitioner9.59.28.5
Power User998.5
Skeptic87.87.5
Value score86.58.5

Benchmarks

MMLU——92.6
MMLU-Pro—92.4—
GPQA Diamond93.693.694.3
SWE-bench Verified88.688.780.6
LiveCodeBench——2887
MMMU—81.280.5
TAU-bench—9890.8
Terminal-Bench74.682.768.5
MRCR Long Context—7484.9
Humanity's Last Exam—41.444.4
LMArena Elo148114821487
LMArena Coding Elo153315201520

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