OpenAI
GPT-5.5
model
gpt-5.5PremiumStableVisionStreamingVisionToolsBatchLong contextUnited States
Context
1.1M
Input / 1M tokens
$5.00
Output / 1M tokens
$30.00
About this model
GPT-5.5
GPT-5.5 is OpenAI's flagship reasoning model — the highest-quality option for complex multi-step work. Best when accuracy matters more than cost. Strong on math, science, and long-form analysis with a 1M-token context window.
Released
2026-01
Training cutoff
2024-11
Parameters
Not disclosed
Best for
Use cases
- ✓Hard reasoning + multi-step planning
- ✓Math, science, and research summarization
- ✓Long-document analysis (1M context)
- ✓High-stakes agentic workflows
Strengths
What it does well
- ●Top-tier reasoning + math
- ●1M-token context window
- ●Native tool calling + JSON mode
- ●Vision built in
Limitations
Know the trade-offs
- !Premium pricing — reserve for genuinely hard tasks
- !Higher latency than GPT-4o (1–3 s TTFT typical)
- !Output tokens charged at $30/Mtok
Code example
Chat completion with GPT-5.5
from openai import OpenAI
client = OpenAI(
base_url="https://api.anoman.io/v1",
api_key="anm-sk-..."
)
response = client.chat.completions.create(
model="gpt-5.5",
messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)Alternatives
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