Synapse Garden
OpenAI · MultimodalReleased 2025-11-19

gpt-5.1-codex-max

openai/gpt-5.1-codex-max id

GPT‑5.1-Codex-Max is purpose-built for agentic coding.

ReasoningTool useChatWeb search
Type
Use gpt-5.1-codex-max
# Drop-in OpenAI-compatible client
$ import { generateText } from 'ai'
$ 
$ const { text } = await generateText({
$   model: 'openai/gpt-5.1-codex-max',
$   baseURL: 'https://synapse.garden/api/v1',
$   apiKey: process.env.MG_KEY,
$   prompt: 'Why is the sky blue?',
$ })
400K
CONTEXT WINDOW
128K
MAX OUTPUT
$1.38/M
INPUT · PER M
$11.00/M
OUTPUT · PER M
PRICING

List prices, every modality.

RatePer million tokens · USD
Input$1.38/M
Output$11.00/M
Cache read$0.138/M
Honest list pricesHow we calculate prices
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FAQ · GPT-5.1-CODEX-MAX

Frequently asked

01 / 04

How do I call gpt-5.1-codex-max from my code?

Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘openai/gpt-5.1-codex-max’ and supply your Synapse Garden API key. No code changes beyond the base URL.

02 / 04

How much does gpt-5.1-codex-max cost?

Input: $1.38/M per million tokens. Output: $11.00/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-5.1-codex-max?

gpt-5.1-codex-max supports a context window of 400K 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-5.1-codex-max 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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