GPT-5-Codex is a large language model from OpenAI, released on September 15, 2025. It accepts text and image input.

When was GPT-5-Codex released?

OpenAI released GPT-5-Codex on September 15, 2025.

How much does GPT-5-Codex cost?

GPT-5-Codex costs $1.25 per 1M input tokens and $10 per 1M output tokens through the OpenAI API. Cached input costs $0.125 per 1M tokens. Prices are from OpenAI's official pricing as of October 5, 2026.

What is GPT-5-Codex's context window?

GPT-5-Codex has a 400K-token context window and can generate up to 128K output tokens.

How does GPT-5-Codex score on benchmarks?

GPT-5-Codex has 2 cited benchmark scores, including WeirdML (Håvard Tveit Ihle) 54.5% and SWE-bench Verified 74.5%. Each score links to its source.

GPT-5-Codex

OpenAI·Degraded·Released 2025-09-15textvision

Context400k

Max output128k

Input / 1M$1.25 ↗

Output / 1M$10 ↗

Cached in$0.125

Benchmarks2

Benchmarks

Cited public sources · rank is exact-benchmark, apples-to-apples

WeirdML (Håvard Tveit Ihle)

#39/9254.5% ↗

SWE-bench Verified

#24/5974.5% ↗

Compare

vs Gemini 4 Argon vs GPT-6.1 Sol vs Claude Sonnet 5.5 vs Muse Spark 1.3 vs GPT-6 Sol vs GPT-6 Luna vs Claude Opus 5.5 vs GPT-6 Astra

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GPT-5-Codex FAQ

What is GPT-5-Codex?: GPT-5-Codex is a large language model from OpenAI, released on September 15, 2025. It accepts text and image input.
When was GPT-5-Codex released?: OpenAI released GPT-5-Codex on September 15, 2025.
How much does GPT-5-Codex cost?: GPT-5-Codex costs $1.25 per 1M input tokens and $10 per 1M output tokens through the OpenAI API. Cached input costs $0.125 per 1M tokens. Prices are from OpenAI's official pricing as of October 5, 2026.
What is GPT-5-Codex's context window?: GPT-5-Codex has a 400K-token context window and can generate up to 128K output tokens.
How does GPT-5-Codex score on benchmarks?: GPT-5-Codex has 2 cited benchmark scores, including WeirdML (Håvard Tveit Ihle) 54.5% and SWE-bench Verified 74.5%. Each score links to its source.

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