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Flagship — best answers, highest costCommercial API
GPT-5 Codex Pricing
OpenAI · openai-gpt-5-codex
Input / 1M tokens
$1.25
Output / 1M tokens
$10.00
Context window
400k tokens
≈ 533 pages of text
Max output
128k tokens
What it costs in practice
Typical request (1,200 in + 400 out tokens)$0.0055
1,000 requests / month$5.50/mo10,000 requests / month$55.00/mo100,000 requests / month$550.00/moEstimate your own workloadOpens the calculator with GPT-5 Codex preloaded — adjust volume and token counts there.
Price history
Only one price point recorded so far.
The staircase chart appears once a price change is detected.
What it excels at
Handles extended codebases and multi-step reasoning within a 400k-token context window and 128k output limit.
The business tradeoff
Output pricing of $10 per million tokens raises costs for long generations; available only via commercial API.
Cheaper from OpenAI
Head-to-head
Vendor list rates, as of Jun 15, 2026 · source: openrouter · per-request examples assume 1,200 input + 400 output tokens.