Model Details
Owner
OpenAI
Released
Feb 2026
Status
Active
Context Length
400K
Max Output
128K
Provider
OpenAI
Where is gpt-5.3-codex a perfect fit?
gpt-5.3-codex is built for full lifecycle software execution, not just code generation—it behaves more like a teammate than a tool. Ideal for:
- Long-running autonomous coding agents working over hours or days
- Full software lifecycle tasks: coding, debugging, deployment, monitoring
- Building complete applications (web apps, games, systems) end-to-end
- Multi-step workflows involving research, tool use, and execution
- Developer productivity acceleration across large codebases
- Professional knowledge work beyond coding (docs, analysis, reports)
- Long-running autonomous coding agents working over hours or days
- Full software lifecycle tasks: coding, debugging, deployment, monitoring
- Building complete applications (web apps, games, systems) end-to-end
- Multi-step workflows involving research, tool use, and execution
- Developer productivity acceleration across large codebases
- Professional knowledge work beyond coding (docs, analysis, reports)
Quick Model Estimate
Your GPT-5 Cost Estimate
💰 Total Cost
USD 3.00
for 1000 input + 1000 output tokens
📥 Input (1000 × $1.750000)
USD 1.5000
📤 Output (1000 × $14.000000)
USD 1.5000
Cost Breakdown
📥 Input 50%
📤 Output 50%
Prices updated daily from official provider data.
Pricing
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 OpenAI
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Text | $1.7500 | $14.0000 | 400,000 tokens | 2026-03-26 | → |
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OpenAI
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Text | $3.5000 | $28.0000 | 400,000 tokens | 2026-03-26 | → |