← All models
Flagship — best answers, highest costCommercial API
GPT-5.1 (batch) Pricing
OpenAI · openai-gpt-5-1-batch
Input / 1M tokens
$0.625
Output / 1M tokens
$5.00
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)$0.0028
1,000 requests / month$2.75/mo10,000 requests / month$27.50/mo100,000 requests / month$275.00/moEstimate your own workloadOpens the calculator with GPT-5.1 (batch) 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
Processes 400k-token contexts and produces up to 128k-token outputs for document synthesis, long-form reasoning, and multi-step analysis.
The business tradeoff
Output pricing at $5 per million tokens and batch-oriented design increase cost and latency for interactive or high-volume real-time use.
Cheaper from OpenAI
Head-to-head
Vendor list rates, as of Jul 22, 2026 · source: openrouter · per-request examples assume 1,200 input + 400 output tokens.