GPT 5.1 Codex Max vs Grok 4.5
Extended-context coding model for large codebase operations.
xAI's Opus-class flagship for frontier coding, agentic tool use, and knowledge work.
No captured outputs for these models yet.
Frequently Asked Questions: GPT 5.1 Codex Max vs Grok 4.5▼
Which is better, GPT 5.1 Codex Max or Grok 4.5?
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Both GPT 5.1 Codex Max and Grok 4.5 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, GPT 5.1 Codex Max or Grok 4.5?
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Grok 4.5 has a lower blended cost. GPT 5.1 Codex Max: $1.25 input / $10.00 output. Grok 4.5: $2.00 input / $6.00 output.
Which has a larger context window, GPT 5.1 Codex Max or Grok 4.5?
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Grok 4.5 has a larger context window: GPT 5.1 Codex Max supports 400K tokens vs Grok 4.5 at 500K tokens.
Do both GPT 5.1 Codex Max and Grok 4.5 support vision?
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Yes, both GPT 5.1 Codex Max and Grok 4.5 support vision/image input.
What are the key differences between GPT 5.1 Codex Max and Grok 4.5?
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GPT 5.1 Codex Max and Grok 4.5 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 GPT 5.1 Codex Max and Grok 4.5 for free on idapt.app to see which performs better for your specific needs.