Model detail
gpt-5.4-pro
GPT-5.4 Pro is OpenAI's most advanced model, building on GPT-5.4's unified architecture with enhanced reasoning capabilities for complex, high-stakes tasks. It features a 1M+ token context window (922K input, 128K output) with support for text and image inputs. Optimized for step-by-step reasoning, instruction following, and accuracy, GPT-5.4 Pro excels at agentic coding, long-context workflows, and multi-step problem solving.
Model specs
- Context length
- 1.05M
- Max output
- 128K
- I/O modalities
- Text / Image
- Released
- 2026-03
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API endpoints
One MixRoute gateway, OpenAI-compatible
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OpenAI-compatible
/v1/chat/completionsPOST
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Tiered pricing
Unit: /1M Tokens
| Tier | Input /1M Tokens | Output /1M Tokens |
|---|---|---|
| standard Length ≤ 272K | $30.0000 | $180.0000 |
| long_context Length > 272K | $60.0000 | $270.0000 |
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Selection summary
Quickly judge whether it fits your workload
What is this model good for?
High-accuracy reasoning for complex and high-stakes tasks
Use gpt-5.4-pro for demanding reasoning, agentic coding, long-context analysis, and multi-step problem solving where accuracy matters most.
What should you check before using it?
Measure quality, latency, and cost against a strong baseline
Run a representative evaluation for difficult tasks and confirm current limits, response time, and pricing before selecting the Pro tier.
How should you start?
Use gpt-5.4-pro for the cases that need extra reasoning
Start with model ID gpt-5.4-pro on a small set of high-value tasks and retain a measured fallback for routine workloads.
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Token cost estimator
Live estimate from this page's pricing, not an actual bill
This model has no cache-read price; caching is not counted
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FAQ
gpt-5.4-pro is intended for complex reasoning, agentic coding, long-context analysis, and high-stakes multi-step work where accuracy is especially important.
One endpoint, a testable decision
Test this model and alternate routes with the same request format
Start from a real workload, then let quality, total cost, and failure conditions decide whether to send production traffic.