API providers, route pricing, availability, and recent reliability signals.
Latency, throughput, and reliability signals from recent traffic.
Effective prices over the last 30 days, with current provider list prices for context.
Headline benchmark standings and comparison context.
Daily gateway activity over the last 30 days, with current UTC-day pace projection.
Public apps observed in gateway request traffic for this model.
Uptime trend for this model over the last 24 hours.
Start calling this model with endpoint-specific examples.
Key dates, capabilities, and model metadata.
Commercial plans and bundled access that currently include this model.
OpenAI: GPT 5.1 Chat
API providers, route pricing, availability, and recent reliability signals.
Latency, throughput, and reliability signals from recent traffic.
Weighted provider pricing over the last 30 days, with recent route pricing history below.
Headline benchmark standings and comparison context.
Daily gateway activity over the last 30 days, with current UTC-day pace projection.
Public apps observed in gateway request traffic for this model.
Uptime trend for this model over the last 24 hours.
Start calling this model with endpoint-specific examples.
Key dates, capabilities, and model metadata.
13 Nov 2025·8 months ago
13 Nov 2025·8 months ago
22 Apr 2026·3 months ago
23 Jul 2026·In 11 days
Parameters
Not listed
License
Proprietary
Training Tokens
Not listed
Input
Output
Choose a supported endpoint, pick a main language, then select the example style you want to copy.
Supported API reference routes for this model.
import Phaseo from '@phaseo/sdk';
const client = new Phaseo({
apiKey: process.env.PHASEO_API_KEY,
});
const response = await client.generateResponse({
"model": "openai/gpt-5.1-chat",
"input": "Give me one fun fact about cURL."
});
const outputText = response.output
?.flatMap((item) => item.content ?? [])
.find((item) => item.type === "output_text")
?.text;
console.log(outputText ?? response);Parameters
Aggregated across active providers for the responses route.
Routing will select a compatible provider when a parameter narrows availability, so this list stays model-facing instead of provider-facing.
| Parameter | Description |
|---|---|
max_tokens | Caps output length on endpoints and providers that use the max_tokens field name. |
seed | Requests deterministic sampling when the upstream provider supports seeded generation. |
tool_choice | Controls which tool, if any, the model should call. |
tools | Defines callable tools or functions the model can invoke. |
response_format | Requests plain text, JSON, or schema-constrained output formats. |
structured_outputs | Capability signal for reliable schema-constrained output workflows. |
$1.25 | $10 | $0.125 | -- | -- | -- |
Top benchmark results for openai/gpt-5.1-chat.
Detailed benchmark comparisons now live in the Compare tool.
Weighted by routed usage over the last 30 days.
Weighted input price
--
Per 1M tokens across 0 input tokens
Weighted output price
--
Per 1M tokens across 0 output tokens
| OpenAI | $1.25 | $10 | -- | 0 |