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OpenAI

GPT-5.3-Codex

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...

Capabilities:

Input
  • Text input
  • Image input (vision)
  • File input (PDF)
  • Audio input
  • Video input
Output
  • Text output
  • Image output
  • Audio output
Pricing & availability:

  • OpenRouterOpenRouter

    $1.75 / $14 per M
Sources:
OpenRouterOpenRouter
Share:
Details:

  • OpenAIProvider

    OpenAI

  • Context window

    400K

  • Input price

    $1.75/M

  • Output price

    $14/M

  • Open weights

    No

  • Released

    Feb 2026
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  • CapabilitiesCapabilities
  • METR 50% Time HorizonMETR 50% Time Horizon
  • SWE-Lancer (IC Diamond)SWE-Lancer (IC Diamond)
  • Terminal-Bench 2.0Terminal-Bench 2.0
  • Pricing & availabilityPricing & availability
Benchmark scores:
BenchmarkRankScore
  • METR 50% Time Horizon logoMETR 50% Time Horizon
    Rank—
    Score349.53 min
  • OpenAISWE-Lancer (IC Diamond)
    Rank—
    Score81.4%
  • Terminal-Bench 2.0 logoTerminal-Bench 2.0
    Rank—
    Score78.4%
More OpenAI models:
GPT-5.5 ProGPT-5.5GPT-5.4 Image 2GPT-5.4 NanoGPT-5.4 MiniGPT-5.4 ProGPT-5.4GPT-5.3 Chat