GPT-5.5: API Pricing, Context Window & Benchmarks
GPT-5.5 is a language model from OpenAI, released in April 2026, with multimodal input, a 1.1M-token context window, and pricing from $5.00/M input, $0.500/M cached input, $30.00/M output.
GPT-5.5 is OpenAI's smartest model yet, designed for real work across agentic coding, computer use, knowledge work, and early scientific research. It matches GPT-5.4 per-token latency in real-world serving while reaching a much higher
GPT-5.5 benchmarks
Capability tiers
Standing within each category, adjusted for leaderboard depth.
Real tasks performance
High-confidence performance for GPT-5.5 across real-world prompt categories. Only 95% intervals at most 4 points wide are shown.
Performance by conversation depth
How GPT-5.5 holds up as conversations get longer.
Quality Tracker
GPT-5.5 Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
llm-stats.com - Tue Sep 08 2026GPT-5.5 pricing
Providers
GPT-5.5 starts at $5.00 per million input tokens and $30.00 per million output tokens via OpenAI. Reused prompt prefixes cost $0.500 per million cached input tokens.
| Provider | Input $/M | Cached input $/M | Output $/M | Context in / out | TTFT p95 s | Output p5 c/s | Modalities in / out |
|---|---|---|---|---|---|---|---|
 OpenAI | $5.00 | $0.500 | $30.00 | 1.1M/128.0K | 4.56 | 135 | / |
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-5.5 context window
Input and output token limits for GPT-5.5, plus how it ranks on long-context understanding.
GPT-5.5 API
Run a request to see the response
Use it in your code
Billed at $5.00 input / $0.50 cached input / $30.00 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-5.5",
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-5.5 latency
GPT-5.5 time to first token, sustained output throughput, and failed-request rate from live API traffic over the trailing 7 days.
Provider operational metrics
Time to first token, output throughput, and failed-request rate from live API traffic
GPT-5.5 examples
Recent arena outputs from GPT-5.5, picked from the highest-ranked matchups.
GPT-5.5 license
GPT-5.5 is a proprietary model available under its provider's product and API terms, has a knowledge cutoff of December 2025.
- License
- Proprietary
- Hosted access
- Knowledge cutoff
- December 2025
Proprietary license - usage restrictions apply
GPT-5.5 resources
Official sources for GPT-5.5: api documentation, official playground, official launch post.
GPT-5.5 vs other models
The most-compared alternatives to GPT-5.5 are GLM-5.1, Claude Opus 4.6, Claude Opus 4.8. Open any pair side-by-side for benchmarks, pricing, context, and latency.
Models like GPT-5.5
Models ranked just above and below GPT-5.5 by LLM Stats score.
FAQ
Common questions about GPT-5.5.