GPT-5.1 Instant: API Pricing, Context Window & Benchmarks
GPT-5.1 Instant is a language model from OpenAI, released in November 2025, with multimodal input, a 400K-token context window, and pricing from $1.25/M input and $10.00/M output.
GPT-5.1 Instant is the next iteration of GPT-5, designed to be more conversational than earlier chat models. It features improved instruction following and an adaptive reasoning capability that lets it decide when to think before
GPT-5.1 Instant benchmarks
Capability tiers
Standing within each category, adjusted for leaderboard depth.
Real tasks performance
How GPT-5.1 Instant performs across real-world prompt categories.
Performance by conversation depth
How GPT-5.1 Instant holds up as conversations get longer.
Quality Tracker
GPT-5.1 Instant Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
llm-stats.com - Mon Aug 24 2026GPT-5.1 Instant pricing
Providers
GPT-5.1 Instant starts at $1.25 per million input tokens and $10.00 per million output tokens via OpenAI.
| Provider | Input $/M | Cached input $/M | Output $/M | Context in / out | TTFT p95 s | Output p5 c/s | Modalities in / out |
|---|---|---|---|---|---|---|---|
 OpenAI | $1.25 | — | $10.00 | 400.0K/128.0K | 2.00 | — | / |
Cached input is the discounted price for prompt tokens served from a provider cache. TTFT is time to first token. Output is characters per second; p5 is the sustained floor exceeded by 95% of observed requests.
GPT-5.1 Instant context window
Input and output token limits for GPT-5.1 Instant, plus how it ranks on long-context understanding.
GPT-5.1 Instant API
Run a request to see the response
Use it in your code
Billed at $1.25 input / $10.00 output per 1M tokens through the LLM Stats gateway.
from openai import OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://gateway.llm-stats.com/v1"
)
response = client.chat.completions.create(
model="gpt-5.1-instant-2025-11-12",
messages=[
{"role": "user", "content": "What is machine learning?"}
]
)
print(response.choices[0].message.content)Need an API key? Create one above in the playground, or read the API documentation.
GPT-5.1 Instant latency
GPT-5.1 Instant time to first token, sustained output throughput, and failed-request rate from live API traffic over the trailing 7 days.
GPT-5.1 Instant examples
Recent arena outputs from GPT-5.1 Instant, picked from the highest-ranked matchups.
GPT-5.1 Instant license
GPT-5.1 Instant is a proprietary model available under its provider's product and API terms.
- License
- Proprietary
- Hosted access
Proprietary license - usage restrictions apply
GPT-5.1 Instant resources
Official sources for GPT-5.1 Instant: api documentation, official playground, official launch post.
GPT-5.1 Instant vs other models
The most-compared alternatives to GPT-5.1 Instant are Gemini 3 Pro, GPT-5.1, GPT-5.1 Thinking. Open any pair side-by-side for benchmarks, pricing, context, and latency.
Models like GPT-5.1 Instant
Models ranked just above and below GPT-5.1 Instant by LLM Stats score.
FAQ
Common questions about GPT-5.1 Instant.