---
title: "GPT-5.5 — LLM-TEST.com"
url: /models/gpt-5-5/
canonical_url: https://llm-test.com/models/gpt-5-5/
language: en
type: model
summary: "The previous-generation high-end model, still a capable and widely-deployed choice before GPT-6. Reliable for demanding reasoning and coding where teams have not yet migrated."
last_updated: "2026-11-05"
---

# GPT-5.5

_OpenAI · Flagship_

The previous-generation high-end model, still a capable and widely-deployed choice before GPT-6. Reliable for demanding reasoning and coding where teams have not yet migrated.

## At a glance

- Released: Feb 10, 2026
- Provider: OpenAI
- Context window: 500,000 tokens
- Max output: 64,000 tokens
- Modalities: Text + image → text
- Knowledge cutoff: October 2025
- API model ID: `gpt-5.5`
- License: Proprietary (API only)

## Pricing

- Standard: $5 input / $30 output per 1M tokens
- Batch: $2.50 input / $15 output per 1M tokens
- Example: a 1,500-token prompt + 650-token answer ≈ $0.027 (standard)

## What's new vs GPT-5 (August 2025)

- Stronger reasoning and coding than GPT-5
- Better long-context handling
- Improved reliability on agentic tasks
- Superseded by the GPT-6 generation
- Older knowledge cutoff than GPT-6 models

## Best use cases

- **Established workloads** — Powers apps built before GPT-6 without a migration.
- **Reasoning and coding** — Handles complex technical tasks competently.
- **General assistant** — Serves broad chat and generation needs.

## Strengths

- Proven capability
- Good reasoning
- Multimodal
- Mature tooling

## Limitations

- Older cutoff
- Outclassed by GPT-6 flagships

## Where to get access

- Consumer app: ChatGPT (web, desktop, mobile) — https://chatgpt.com
- API: the OpenAI Platform — https://platform.openai.com
- Also available: Microsoft Azure OpenAI Service
- Docs: https://platform.openai.com/docs

Full comparison and live pricing: https://llm-test.com/ · directory: https://llm-test.com/models/