GPT-4 Turbo was released by OpenAI on November 6, 2023, as a flagship model in the GPT line.
GPT-4 Turbo reads up to 128K tokens in one prompt, more than 300 pages of text, and costs a third as much as GPT-4 for input and half as much for output.
Compared with GPT-4 · the model it replaces
Reads more than 300 pages of text in a single prompt
Context window — how much text the model can read at once
128K tokens
▲ up from 8K tokens for GPT-4, or 32K for its larger version
Costs a third as much as GPT-4 for input and half as much for output
Price per 1M tokens — what developers pay, input / output
$10 / $30
▲ down from $30 / $60 for GPT-4 · 3x cheaper input, 2x cheaper output
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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