GPT-5.1 vs Grok 4.20

Grok 4.20 costs 1.7x less per output token.

Which Is Cheaper?

At 1M tokens/mo

GPT-5.1: $6

Grok 4.20: $4

At 10M tokens/mo

GPT-5.1: $56

Grok 4.20: $40

At 100M tokens/mo

GPT-5.1: $563

Grok 4.20: $400

Which Performs Better?

TestGPT-5.1Grok 4.20
Structured Output——
Strategic Analysis——
Constrained Rewriting——
Creative Problem Solving——
Tool Calling——
Faithfulness——
Classification——
Long Context——
Safety Calibration——
Persona Consistency——
Agentic Planning——
Multilingual——
Full GPT-5.1 profile →Full Grok 4.20 profile →
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Claude Haiku 4.5 vs GPT-5.1Claude Haiku 4.5 vs Grok 4.20Devstral Medium vs GPT-5.1Devstral Medium vs Grok 4.20Gemini 2.5 Flash vs GPT-5.1Gemini 2.5 Flash vs Grok 4.20