Grok 4.5 vs GPT 5.1 Codex Max
xAI's Opus-class flagship for frontier coding, agentic tool use, and knowledge work.
Extended-context coding model for large codebase operations.
No captured outputs for these models yet.
Frequently Asked Questions: Grok 4.5 vs GPT 5.1 Codex Max▼
Which is better, Grok 4.5 or GPT 5.1 Codex Max?
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Both Grok 4.5 and GPT 5.1 Codex Max are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.
Which is cheaper, Grok 4.5 or GPT 5.1 Codex Max?
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Grok 4.5 has a lower blended cost. Grok 4.5: $2.00 input / $6.00 output. GPT 5.1 Codex Max: $1.25 input / $10.00 output.
Which has a larger context window, Grok 4.5 or GPT 5.1 Codex Max?
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Grok 4.5 has a larger context window: Grok 4.5 supports 500K tokens vs GPT 5.1 Codex Max at 400K tokens.
Do both Grok 4.5 and GPT 5.1 Codex Max support vision?
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Yes, both Grok 4.5 and GPT 5.1 Codex Max support vision/image input.
What are the key differences between Grok 4.5 and GPT 5.1 Codex Max?
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Grok 4.5 and GPT 5.1 Codex Max have similar overall capabilities. The main differences lie in pricing, context window size, and provider-specific strengths. Use this comparison page to review all metrics side by side.
Which model should I choose for my use case?
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If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Grok 4.5 and GPT 5.1 Codex Max for free on idapt.app to see which performs better for your specific needs.