gpt-5.6-terra — API, Pricing & Context Window | Vivgrid

gpt-5.6-terra is the balanced model in OpenAI's gpt-5.6 family and the successor to gpt-5.4, delivering most of gpt-5.6-sol's coding and reasoning quality at half the price. Its 1.05M-token context window makes it a strong default for production agents.

On Vivgrid, gpt-5.6-terra is served through a single OpenAI-compatible endpoint with geo-distributed acceleration across AMER and EMEA, reachable with the same unified key as the rest of the catalog.

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.

Requests beyond 272K input tokens are billed at the long-context rate: $5.00 input / $0.50 cached input / $22.50 output per 1M tokens.

API surfaces

The Vivgrid Console catalogs gpt-5.6-terra on 2 surfaces, 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-5.6-terra directly.

curl https://api.vivgrid.com/v1/chat/completions \
  -H "Authorization: Bearer $VIVGRID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.6-terra",
    "messages": [
      { "role": "user", "content": "Say hello in English, Chinese and Spanish." }
    ],
    "stream": true
  }'

Ideal use cases

• Production coding agents balancing quality, speed, and cost
• Whole-repository analysis within a 1.05M-token context
• High-volume tool-calling workflows on Chat Completions
• Teams standardizing on one model across coding and agent tasks

Related models

• gpt-6.1-sol — the balanced gpt-6 model at a lower price
• gpt-5.6-sol — the flagship gpt-5.6 model
• gpt-5.6-luna — the fast, low-cost gpt-5.6 model