Claude Sonnet 5.5 vs GPT-6.1 Sol
How does Claude Sonnet 5.5 (Anthropic) compare against GPT-6.1 Sol (OpenAI)? Side-by-side scores, capability ratings and pricing, plus a clear verdict.
🏆 Quick verdict
Claude Sonnet 5.5 comes out ahead with an AIVerso score of 97 vs 96 and an aggregate capability rating of 649 vs 644 across 7 categories. GPT-6.1 Sol still leads on Long Context.
Overall winner
Claude Sonnet 5.5
by Anthropic
Score: 97/100
PriceFree – $20/mo (Pro)
Pricing details$2/$10 per 1M (API)
Context window1M
Free tierYes
API accessYes
Open sourceNo
Headline factsFree on claude.ai · #2 on the AA Intelligence Index (56) · Terminal-Bench 4.0 70.6% · 30%+ faster than Sonnet 5 · $2/$10 per 1M
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GPT-6.1 Sol
by OpenAI
Score: 96/100
Price$2/$10 per 1M tokens
Context window1M
Free tierNo
API accessYes
Open sourceNo
Headline factsNearly matches GPT-6 Astra on coding & computer use (OpenAI) at a fifth of the task cost · AA Intelligence Index 52 · $2/$10 per 1M · 1.05M context
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📊 Capability ratings
AIVerso capability ratings (0–100) per category — an editorial summary informed by public benchmark results. Higher is better.
Category
Claude Sonnet 5.5
GPT-6.1 Sol
Math & Logice.g. AIME, MATH-500
93
93
Programminge.g. SWE-bench, LiveCodeBench
93
92
Reasoninge.g. GPQA, ARC
93
92
Knowledgee.g. MMLU-Pro
90
90
Long Contexte.g. MRCR, needle tests
92
94
Instruction Followinge.g. IFEval
94
92
Agent Capabilitye.g. Terminal-Bench, tool use
94
91
Why Claude Sonnet 5.5
Higher overall score (97 vs 96)
Has a free tier
Leads on Programming (93 vs 92)
Leads on Reasoning (93 vs 92)
Leads on Instruction Following (94 vs 92)
Leads on Agent Capability (94 vs 91)
Free on claude.ai
Why GPT-6.1 Sol
Leads on Long Context (94 vs 92)
Nearly matches GPT-6 Astra on coding & computer use (OpenAI) at a fifth of the task cost
AA Intelligence Index 52
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❓ Frequently Asked Questions
Which is better: Claude Sonnet 5.5 or GPT-6.1 Sol?
Claude Sonnet 5.5 has the higher AIVerso score (97 vs 96). The better choice still depends on your use case — GPT-6.1 Sol leads on Long Context.
How much does Claude Sonnet 5.5 cost compared to GPT-6.1 Sol?
Claude Sonnet 5.5: Free – $20/mo (Pro) ($2/$10 per 1M (API)). GPT-6.1 Sol: $2/$10 per 1M tokens. Only Claude Sonnet 5.5 has a free tier.
What context window does each support?
Claude Sonnet 5.5: 1M tokens. GPT-6.1 Sol: 1M tokens. The context window determines how much text, code or chat history a model can process at once.
Are Claude Sonnet 5.5 and GPT-6.1 Sol open source?
Claude Sonnet 5.5 is a closed, proprietary model. GPT-6.1 Sol is a closed, proprietary model.
How we compare: Scores and capability ratings are based on public benchmarks and provider documentation — not on commission rates. Last updated: October 2, 2026.