This model is 13 months old. A newer version of it has since shipped: GPT-6 Astra (2026-09-03). The details below are still accurate for this model — it just is not what we would recommend today.
GPT-5
OpenAI🇺🇸 United States
OpenAI's unified flagship merging the GPT and o-series lines: a real-time router picks between fast responses and deeper reasoning. 400K context, 128K max output.
Context window400K tokens
Input / 1M tokens$1.25
Output / 1M tokens$10
Version History
gpt-5-launchmajor
GPT-5 launches. OpenAI's unified flagship merging the GPT and o-series lines: a real-time router picks between fast responses and deeper reasoning. 400K context, 128K max output.
Benchmark Scores
Full leaderboard →94.6%
AIME 2025
85.7%
GPQA
14.7%
Hallucination (Summarization)
90.1%
Hallucination Rate
93.4%
HumanEval
84.7%
MATH
92.5%
MMLU
84.2%
MMMU
74.9%
SWE-bench Verified