GPT-5.4
by OpenAI
An OpenAI flagship. Strong, well-rounded reasoning that handles tricky multi-step work without getting lost. Try GPT-5.4 on Zo.
Knowledge cutoffAug 2025
Context window1M tokens
Release dateMar 2026
Input
$2.50 / 1M tokensOutput
$15.00 / 1M tokensCached
$0.25 / 1M tokensHow we rate models
- Quality. Three brains is top, one is basic. We anchor the rating on SWE-bench Verified — the industry-standard coding benchmark — how often a model solves real GitHub issues end-to-end.
- Fast. Shown when the model can produce at least roughly 80 tokens per second (about 60 words a second). Not every model qualifies.
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- Cost. Single dollar is the cheapest tier (green), three dollars is the priciest (amber). We bucket models relative to the other models you can pick from on Zo, so the tier is meaningful across providers.
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