GPT-4o was released by OpenAI on May 13, 2024, as a flagship model in the GPT line.
GPT-4o handles text, audio and images in one model, answers speech in 320 milliseconds on average (GPT-4 Voice Mode took 5.4 seconds) and costs half as much as GPT-4 Turbo in the API.
Compared with GPT-4 Turbo · the model it replaces
Answers spoken questions in about a third of a second
Voice response time — average delay before it answers spoken input
320 ms
▲ down from 5.4 seconds in GPT-4 Voice Mode
Costs half as much as GPT-4 Turbo
Price per 1M tokens — what developers pay, input / output
$5 / $15
▲ down from $10 / $30 · 50% cheaper
Every Monday, only when something shipped: the AI models that came out, what each one changed, and which lines are due next.
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GPT-6.1 Sol is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
Latest: GPT-6.1 Sol · Sep 29, 2026
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