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Spec
GPT-5.5
Grok 3
Intelligence index↑ better
Winner82
74
Speed↑ better
Winner95 tok/s
75 tok/s
Time to first token↓ better
Winner0.42 s
0.6 s
Context window↑ better
400k
Winner1M
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
Grok 3
88.0
MMLU Pro
GPT-5.5
78.0
Grok 3
76.0
GPQA
GPT-5.5
62.5
Grok 3
62.0
MATH
GPT-5.5
89.1
Grok 3
88.5
HumanEval
GPT-5.5
93.0
Grok 3
90.0
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
Grok 3
Strengths
- Live X data
- 1M context
- Strong reasoning mode
Weaknesses
- Smaller ecosystem
- Less tool-use tooling
Best for
- Real-time research
- Social-aware apps
Quick verdict
- Pick GPT-5.5 if you want it smarter and faster.
- Pick Grok 3 if you want it cheaper and longer context.
Auto-generated from the spec sheet. Always validate on your own evals.
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