GPT-5.3-Codex
Provider：OpenAI
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
Key specs
- Context：400K
- Max output：128K
- Tokenizer：GPT
- Released：2026-02-24
Token pricing
- Input price：$1.75 / 1M tokens
- Output price：$14.00 / 1M tokens
- Cache read：$0.175 / 1M tokens
- Blended price：$4.81 / 1M tokens
Modalities
Text, Image, File
Use Cases
- Code Generation & Review：Auto-complete functions, generate unit tests, cross-file refactor suggestions; supports JSON Schema–constrained output for direct API integration.（≈ $0.056/call）
- Deep Reasoning & Analysis：Process long legal docs, academic papers, financial reports; multi-hop reasoning and evidence-chain tracing across huge contexts.（≈ $0.112/call）
- Vision Understanding & Generation：Recognize data trends in charts, OCR scanned docs, analyze photos and produce structured reports.（≈ $0.084/call）
- Chat & Support：FAQ auto-response, multi-turn dialogue, emotion detection — e-commerce, finance, gov.（≈ $0.028/call）
When to pick this model
Signals derived from public pricing and spec fields — not a benchmark. Validate with official docs and your own eval.
- Long max output (>=30K tokens): strong fit for deep report / essay / document-drafting workflows.
- Multimodal (text+image): fit for image captioning, OCR, chart QA, vision-grounded reasoning.
- File / PDF input support: fit for document parsing, contract review, RAG over private data.
FAQ
- What is the token pricing of GPT-5.3-Codex? Input price $1.75 / 1M tokens, output price $14.00 / 1M tokens, blended about $4.81 / 1M tokens. Refer to OpenAI’s official page for the exact rate.
- What context window does GPT-5.3-Codex support? Context window is 400K, max output about 128K, suitable for long documents, multi-turn chat and complex reasoning.
- What scenarios is GPT-5.3-Codex best for? Based on its capability and pricing, GPT-5.3-Codex fits best: Code Generation & Review, Deep Reasoning & Analysis, Vision Understanding & Generation. See the Use Cases section for details and cost estimates.
- What input/output modalities does GPT-5.3-Codex support? Supports Text, Image, File modality.
- Is GPT-5.3-Codex a free model? GPT-5.3-Codex is billed per token, not a free model.
- Which provider offers GPT-5.3-Codex? GPT-5.3-Codex is offered by OpenAI.
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Full info：GPT-5.3-Codex