OpenAI · MultimodalReleased 2026-04-24

gpt-5.5

openai/gpt-5.5 id

GPT‑5.5 understands what you’re trying to do faster and can carry more of the work itself. It excels at writing and debugging code, researching online, analyzing data, creating documents and spreadsheets, operating software, and moving across tools until a task is finished. Instead of carefully managing every step, you can give GPT‑5.5 a messy, multi-part task and trust it to plan, use tools, check its work, navigate through ambiguity, and keep going.

ReasoningTool useWeb searchChatJSON outputStructured output

Type

Use gpt-5.5

# Drop-in OpenAI-compatible client
$ import { generateText } from 'ai'
$ 
$ const { text } = await generateText({
$   model: 'openai/gpt-5.5',
$   baseURL: 'https://synapse.garden/api/v1',
$   apiKey: process.env.MG_KEY,
$   prompt: 'Why is the sky blue?',
$ })

CONTEXT WINDOW

128K

MAX OUTPUT

$5.50/M

INPUT · PER M

$33.00/M

OUTPUT · PER M

PRICING

List prices, every modality.

Rate	Per million tokens · USD
Input	$5.50/M
Output	$33.00/M
Cache read	$0.550/M

Honest list pricesHow we calculate prices

Other OpenAI models

See all 48

Model

Input

Output

Context

Type

FAQ · GPT-5.5

Frequently asked

01 / 04

How do I call gpt-5.5 from my code?

Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘openai/gpt-5.5’ and supply your Synapse Garden API key. No code changes beyond the base URL.

02 / 04

How much does gpt-5.5 cost?

Input: $5.50/M per million tokens. Output: $33.00/M per million tokens. The free tier includes a million tokens every month at no cost.

03 / 04

What's the context window for gpt-5.5?

gpt-5.5 supports a context window of 1M tokens, with a maximum output of 128K tokens.

04 / 04

Do I need a separate Anthropic or OpenAI account?

No. Synapse Garden is the single API surface — one key gives you OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, xAI, Cohere, and more. Billing, rate limits, and audit logs are unified.

READY

Try gpt-5.5 in three minutes.

Sign up, create a key, drop our base URL into your existing client. The free tier includes a million tokens every month — no credit card.

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