gpt-5.5 — API, Pricing & Context Window | Vivgrid

gpt-5.5 is OpenAI's flagship model and Vivgrid's top recommendation for coding agents. It pairs a 1.05M-token context window with strong multi-step reasoning, making it well suited for whole-repository refactors, long agent traces, and complex tool-calling workflows.

On Vivgrid, gpt-5.5 is served through a single OpenAI-compatible endpoint with geo-distributed acceleration across AMER and EMEA, so requests are routed to the nearest compute region for lower latency. You can switch your agent to gpt-5.5 from the Console without changing a line of application code.

Specifications

Pricing

Pricing in USD per 1M tokens, matching the provider's rates.

What one request costs

The rates above applied to a 20K-token prompt with a 2K-token reply — a typical single agent turn, small enough that every request is billed at the base rate.

API surfaces

The Vivgrid Console catalogs gpt-5.5 on one surface, all behind the same API key. The endpoint shown is the one the Console previews for that surface.

Quick start

Get an API key from the Vivgrid Console, then call gpt-5.5 directly.

curl https://api.vivgrid.com/v1/chat/completions \
  -H "Authorization: Bearer $VIVGRID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.5",
    "messages": [
      { "role": "user", "content": "Say hello in English, Chinese and Spanish." }
    ],
    "stream": true
  }'

Ideal use cases

• Autonomous coding agents and CLI tools (Codex, OpenCode, Claude Code-style flows)
• Large-context tasks: reading and editing entire codebases in one pass
• High-stakes reasoning where output quality outweighs token cost
• Multi-tool agents that chain function calls across long sessions

Related models

• gpt-6-astra — the gpt-6 generation flagship
• gpt-6.1-sol — the balanced gpt-6 model at a lower price
• gpt-5.3-codex — Codex-tuned variant on the Responses API