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GPT-5.5

Frontier

OpenAI's flagship — frontier reasoning and the model behind Codex's hardest runs.

OpenAI
Maker
93/100
Overall
40
Value score
$13
Blended /1M
1.1M
Context
Proprietary
Weights
Pricing: $5.00 in · $30 out / 1M tokens · synced from OpenRouter · updated 2026-06-22

Scorecard

Output Quality9.6/10 · 80% community
Agentic Ability9.5/10 · 80% community
Speed7.0/10 · 67% community
Value for $7.5/10 · 70% community
Reliability9.0/10 · 77% community

GPT-5.5 is OpenAI's top general model in 2026: frontier-level reasoning, strong tool use, and a 1M-token context. It trades the top coding spot with Claude Opus depending on the task, and is the natural pick for developers already in the OpenAI ecosystem or running Codex CLI.

Strengths
  • Frontier reasoning and tool use
  • 1M-token context
  • Deep ecosystem and tooling
Trade-offs
  • Premium pricing
  • Slower than mini/flash tiers

Agents that run GPT-5.5 well

Hard reasoning and coding for teams in the OpenAI ecosystem.

Best model for CodexBest model for ClineBest model for AiderBest model for CursorBest model for OpenCodeBest model for OpenClaw

GPT-5.5 FAQ

Is GPT-5.5 good for AI agents?
Hard reasoning and coding for teams in the OpenAI ecosystem. On our editorial scoring it rates 9.5/10 for agentic ability and 9.6/10 for output quality. Frontier reasoning and tool use.
How much does GPT-5.5 cost?
Via OpenRouter, GPT-5.5 is priced at $5.00 in · $30 out / 1M tokens — a blended rate of about $13 per 1M tokens for typical input-heavy agent use.
What is GPT-5.5's context window?
GPT-5.5 has a 1.1M-token context window — large enough to hold sizeable codebases or document sets in a single run. OpenAI is the maker.
Can I self-host GPT-5.5?
No — GPT-5.5 is a proprietary, hosted-only model from OpenAI. You access it through an API (e.g. OpenRouter) rather than running the weights yourself.
What are the downsides of GPT-5.5?
The main trade-offs: premium pricing; slower than mini/flash tiers. It's strongest for hard reasoning and coding for teams in the openai ecosystem.

GPT-5.5 compared

GPT-5.5 vs Opus 4.8GPT-5.5 vs Gemini 3.1 ProGPT-5.5 vs GLM 5.2GPT-5.5 vs Qwen3.7 MaxGPT-5.5 vs DeepSeek V4 ProGPT-5.5 vs Kimi K2.6GPT-5.5 vs Grok 4.3GPT-5.5 vs Grok 4.20

The model is half the story — the agent is the other half

The model picks the moves; the agent runs the loop, the tools, and the guardrails. Once you've chosen a model, see which agent gets the most out of it.

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