DeepSeek V4 Pro vs GPT 5.3 Codex
Open-source 1.6T-parameter MoE with 49B active, built for advanced reasoning and long-horizon agents.
OpenAI's most advanced agentic coding model with 400K context.
No captured outputs for these models yet.
Frequently Asked Questions: DeepSeek V4 Pro vs GPT 5.3 Codex▼
Which is better, DeepSeek V4 Pro or GPT 5.3 Codex?
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Based on the Capability Index, GPT 5.3 Codex scores higher (87.0 vs 81.6). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Which is cheaper, DeepSeek V4 Pro or GPT 5.3 Codex?
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DeepSeek V4 Pro has a lower blended cost. DeepSeek V4 Pro: $0.43 input / $0.87 output. GPT 5.3 Codex: $1.75 input / $14.00 output.
Which has a larger context window, DeepSeek V4 Pro or GPT 5.3 Codex?
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DeepSeek V4 Pro has a larger context window: DeepSeek V4 Pro supports 1M tokens vs GPT 5.3 Codex at 400K tokens.
Do both DeepSeek V4 Pro and GPT 5.3 Codex support vision?
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GPT 5.3 Codex supports vision/image input, but DeepSeek V4 Pro does not.
Which has better coding performance, DeepSeek V4 Pro or GPT 5.3 Codex?
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DeepSeek V4 Pro scores higher on SWE-bench Verified: DeepSeek V4 Pro resolves 78% vs GPT 5.3 Codex at 75%.
What are the key differences between DeepSeek V4 Pro and GPT 5.3 Codex?
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Key differences: GPT 5.3 Codex has a notably higher capability index (5.4 point gap); DeepSeek V4 Pro is significantly cheaper; only GPT 5.3 Codex supports vision input. Compare full specs on this page.
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 DeepSeek V4 Pro and GPT 5.3 Codex for free on idapt.app to see which performs better for your specific needs.