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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 on SWE-Bench Pro and strong performance on Terminal-Bench 2.0 and OSWorld-Verified, reflecting improved multi-language coding, terminal proficiency, and real-world computer-use skills. The model is optimized for long-running, tool-using workflows and supports interactive steering during execution, making it suitable for complex development tasks, debugging, deployment, and iterative product work. Beyond coding, GPT-5.3-Codex performs strongly on structured knowledge-work benchmarks such as GDPval, supporting tasks like document drafting, spreadsheet analysis, slide creation, and operational research across domains. It is trained with enhanced cybersecurity awareness, including vulnerability identification capabilities, and deployed with additional safeguards for high-risk use cases. Compared to prior Codex models, it is more token-efficient and approximately 25% faster, targeting professional end-to-end workflows that span reasoning, execution, and computer interaction.
Quality Index
54.0
3rd of 442
Top 1%
Coding Index
53.1
3rd of 352
Top 1%
Price/1M
$4.81
621st cheapest
1453% above median
Top 92%
Speed
66 tok/s
Top 38%
TTFT
51.83s
Context Window
400K
41st largest
Top 16%
Input
$1.75
per 1M tokens
Output
$14.00
per 1M tokens
Blended
$4.81
per 1M tokens
Cheaper than 8% of models. Median price is $0.31/1M tokens.
Daily
$4.81
Monthly
$144.39
66
tokens/sec
Faster than 62% of models
51.83
seconds
Faster than 1% of models
51.83
seconds
Faster than 3% of models
Market Median
46 tok/s
46% faster
Median TTFT
0.42s
12299% slower
Throughput/Dollar
14
tok/s per $/1M
Speed Comparison
Context Window
400K
tokens
Larger than 84% of models
Max Output
128K
tokens
32% of context