GPT-6.1 Terra vs Claude Sonnet 5.5
How does GPT-6.1 Terra (OpenAI) compare against Claude Sonnet 5.5 (Anthropic)? 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 632 across 7 categories. GPT-6.1 Terra wins on price — lower API price ($1/$5 per 1M tokens vs $2/$10 per 1M (API)).
GPT-6.1 Terra
by OpenAI
Score: 96/100
Price$1/$5 per 1M tokens
Pricing detailsAPI $1/$5 per 1M (higher above 272K tokens) · ChatGPT Plus $20/mo · also in ChatGPT Pro, Enterprise & Edu
Context window1.05M
Free tierNo
API accessYes
Open sourceNo
BenchmarksAA Intelligence Index v5: 51
Headline factsOpenAI’s fast computer-use model (Oct 26) · AA Intelligence Index 51 · Terminal-Bench 4.0 50.3% (OpenAI) · 3× faster than GPT-6.1 Sol · $1/$5 per 1M · 1.05M context
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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
BenchmarksAA Intelligence Index v5: 55
Headline factsFree on claude.ai · AA Intelligence Index 55 · Terminal-Bench 4.0 70.6% · 30%+ faster than Sonnet 5 · $2/$10 per 1M
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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
GPT-6.1 Terra
Claude Sonnet 5.5
Math & Logice.g. AIME, MATH-500
90
93
Programminge.g. SWE-bench, LiveCodeBench
89
93
Reasoninge.g. GPQA, ARC
90
93
Knowledgee.g. MMLU-Pro
88
90
Long Contexte.g. MRCR, needle tests
92
92
Instruction Followinge.g. IFEval
91
94
Agent Capabilitye.g. Terminal-Bench, tool use
92
94
Why GPT-6.1 Terra
Lower API price ($1/$5 per 1M tokens vs $2/$10 per 1M (API))
Larger context window (1.05M vs 1M)
OpenAI’s fast computer-use model (Oct 26)
AA Intelligence Index 51
Why Claude Sonnet 5.5
Higher overall score (97 vs 96)
Has a free tier
Leads on Math & Logic (93 vs 90)
Leads on Programming (93 vs 89)
Leads on Reasoning (93 vs 90)
Leads on Knowledge (90 vs 88)
Leads on Instruction Following (94 vs 91)
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❓ Frequently Asked Questions
Which is better: GPT-6.1 Terra or Claude Sonnet 5.5?
Claude Sonnet 5.5 has the higher AIVerso score (97 vs 96). The better choice still depends on your use case — GPT-6.1 Terra is the cheaper option.
How much does GPT-6.1 Terra cost compared to Claude Sonnet 5.5?
GPT-6.1 Terra: $1/$5 per 1M tokens (API $1/$5 per 1M (higher above 272K tokens) · ChatGPT Plus $20/mo · also in ChatGPT Pro, Enterprise & Edu). Claude Sonnet 5.5: Free – $20/mo (Pro) ($2/$10 per 1M (API)). Only Claude Sonnet 5.5 has a free tier.
What context window does each support?
GPT-6.1 Terra: 1.05M tokens. Claude Sonnet 5.5: 1M tokens. The context window determines how much text, code or chat history a model can process at once.
Are GPT-6.1 Terra and Claude Sonnet 5.5 open source?
GPT-6.1 Terra is a closed, proprietary model. Claude Sonnet 5.5 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: November 11, 2026.