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GPT-5.5 vs Claude 4 Sonnet
Side-by-side intelligence, speed, price, benchmarks, strengths and weaknesses for GPT-5.5 and Claude 4 Sonnet — refreshed monthly.
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Spec
GPT-5.5
Claude 4 Sonnet
Intelligence index↑ better
Winner82
75
Speed↑ better
95 tok/s
95 tok/s
Time to first token↓ better
Winner0.42 s
0.85 s
Context window↑ better
400k
Winner500k
Max output↑ better
16k
16k
Input price↓ better
$5.00 / 1M tokens
Winner$3.00 / 1M tokens
Output price↓ better
$15.00 / 1M tokens
$15.00 / 1M tokens
Blended price↓ better
$7.50 / 1M tokens
Winner$6.00 / 1M tokens
License
Proprietary
Proprietary
Input modalities
text, image
text, image
Output modalities
text
text
Benchmark showdown
MMLU
GPT-5.5
90.2
Claude 4 Sonnet
88.5
MMLU Pro
GPT-5.5
78.0
Claude 4 Sonnet
75.2
GPQA
GPT-5.5
62.5
Claude 4 Sonnet
58.0
MATH
GPT-5.5
89.1
Claude 4 Sonnet
82.0
HumanEval
GPT-5.5
93.0
Claude 4 Sonnet
93.2
Strengths, weaknesses and best-for
GPT-5.5
Strengths
- Best-in-class reasoning
- Huge 400k context
- Strong tool use and agents
Weaknesses
- Expensive vs Sonnet for non-reasoning tasks
- Higher latency than gpt-5.5-mini
Best for
- Agentic workflows
- Complex coding
- Hard math & research
Claude 4 Sonnet
Strengths
- Best $/HumanEval ratio
- Fast
- 500k context
Weaknesses
- Behind Opus on hardest reasoning
Best for
- Production coding tools
- Long-context RAG
- Tool use
Quick verdict
- Pick GPT-5.5 if you want it smarter.
- Pick Claude 4 Sonnet if you want it cheaper and longer context.
Auto-generated from the spec sheet. Always validate on your own evals.
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