# GPT-5 Codex ![Organization](https://img.shields.io/badge/Org-OpenAI-74aa9c) ![License](https://img.shields.io/badge/License-Proprietary-d29922) ![Released](https://img.shields.io/badge/Released-Sep%202025-555) ![Focus](https://img.shields.io/badge/Focus-Coding-1f6feb) > **Quick answer:** GPT-5 Codex is OpenAI's September 2025 coding-specialised model, scoring 74.5% on SWE-Bench Verified. It represents OpenAI's revival of the "Codex" brand for code-focused models within the GPT-5 generation, targeting real-world software engineering tasks. ## At a Glance **Where GPT-5 Codex leads** - 74.5% SWE-Bench Verified — strong real-world software engineering - Specialised for code generation and software engineering tasks - GPT-5 generation quality in a code-focused variant **Where it lags** - September 2024 knowledge cutoff — earlier than GPT-5.1 Codex - Superseded by GPT-5.1 Codex (February 2026) for most coding tasks - Proprietary: no open weights - Text-only (coding focus) **Best for:** Software engineering agentic tasks using the Codex interface; production coding pipelines; automated code review and PR fixing. ## What GPT-5 Codex Is GPT-5 Codex (released September 2025) is OpenAI's code-specialised model in the GPT-5 generation — a revival of the Codex brand last seen in the original Codex/Copilot era. It is distinct from the general-purpose GPT-5 models, with training and fine-tuning specifically targeting software engineering. The 74.5% SWE-Bench Verified score places it competitively with DeepSeek-V3.2 Speciale (73.1%) and just above the threshold that makes models practical for real-world repository-level coding tasks. GPT-5.1 Codex (February 2026) provides a modest improvement to 73.7% — suggesting the generation gap between Codex versions was relatively small. ## Specifications | Field | Value | |---|---| | Organization | OpenAI | | License | Proprietary (API only) | | Release date | September 2025 | | Knowledge cutoff | September 2024 | | Modality | Text / Code | | Focus | Software engineering (SWE-Bench) | ## Pricing Available via OpenAI API — refer to the OpenAI pricing page for current Codex model rates. ## Public Benchmark Scores | Benchmark | Score | Source | Date | |---|---|---|---| | [SWE-Bench Verified](/benchmarks/swe-bench-verified) | 74.5% | Benchgen evaluation | 2025-09 | ## GPT-5 Codex vs Alternatives | Model | SWE-Bench Verified | License | |---|---|---| | **GPT-5 Codex** | 74.5% | Proprietary | | [GPT-5.1 Codex](/models/openai/gpt-5-1-codex) | 73.7% | Proprietary | | [DeepSeek-V3.2 Speciale](/models/deepseek/deepseek-v3-2-speciale) | 73.1% | MIT | | [DeepSeek-V4 Flash Max](/models/deepseek/deepseek-v4-flash-max) | 79% | Proprietary | GPT-5 Codex vs DeepSeek-V3.2 Speciale: +1.4pp SWE-Bench, proprietary vs MIT. For open-weight SWE, V3.2 Speciale is preferred. For maximum SWE-Bench: DeepSeek-V4 Flash Max (79%). ## Related Models & Benchmarks - Compare: [GPT-5.1 Codex](/models/openai/gpt-5-1-codex) · [DeepSeek-V3.2 Speciale](/models/deepseek/deepseek-v3-2-speciale) · [DeepSeek-V4 Flash Max](/models/deepseek/deepseek-v4-flash-max) - Benchmarks: [SWE-Bench Verified](/benchmarks/swe-bench-verified) ## Frequently Asked Questions

What is GPT-5 Codex?

OpenAI's September 2025 coding-specialised model scoring 74.5% SWE-Bench Verified. A GPT-5 generation revival of the Codex brand for software engineering tasks.

What is the difference between GPT-5 Codex and GPT-5.1 Codex?

GPT-5.1 Codex (February 2026) is the updated version — slightly lower SWE-Bench (73.7% vs 74.5%) but with a more recent September 2025 knowledge cutoff.

--- *Specs from OpenAI's GPT-5 Codex release (September 2025) and Benchgen evaluations. Last updated 2026-07-24.*

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