OpenAI
GPT-5.6 Terra
GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier.
At a glance
- Input / 1M
- $2
- Output / 1M
- $12
- Context
- 1.05M
- Max output
- 128K
- Intelligence
- 42.1
- Released
- Jul 2026
Pricing
GPT-5.6 Terra API pricing
Per-token rates, plus what common tasks actually cost.
| Input tokensPer 1M tokens | $2 |
|---|---|
| Output tokensPer 1M tokens | $12 |
| Cached input (read)Per 1M tokens | $0.20 |
| Cache writePer 1M tokens | $2.50 |
| Long-context pricingPrompts above 272K tokens | $4 in / $18 out |
| Web searchPer request | $0.01 |
Chat message
2K in, 500 out
$10
per 1,000 requests
Coding task
30K in, 4K out
$108
per 1,000 requests
Long document summary
150K in, 2K out
$324
per 1,000 requests
Benchmarks
GPT-5.6 Terra benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
42.1
Coding index
76.7
Agentic index
43.2
Specs
Context window and capabilities
What it can read, what it can write, and which API features it supports.
- Context window
- 1.05M tokens
- Max output
- 128K tokens
- Input types
- File, Image, Text
- Output types
- Text
- Reasoning effort
- Max, Extra high, High, Medium, Low, None
- Release date
- July 9, 2026
- Knowledge cutoff
- February 16, 2026
- Tool calling
- Structured outputs
- JSON mode
- Reasoning
- Temperature
- Stop sequences
- Deterministic seed
- Verbosity control
Compare
GPT-5.6 Terra vs other models
See how GPT-5.6 Terra stacks up head to head on price, benchmarks, and features.
VSGPT-5.6 Terra vs GPT-6 Sol
OpenAI vs OpenAI
See comparisonVSGPT-5.6 Terra vs GPT-5.6 Sol
OpenAI vs OpenAI
See comparisonVSGPT-5.6 Terra vs GLM 5.3
OpenAI vs Z.ai
See comparisonVSGPT-5.6 Terra vs Grok 4.6
OpenAI vs xAI
See comparisonVSGPT-5.6 Terra vs Kimi K3
OpenAI vs Moonshot AI
See comparisonVS
GPT-5.6 Terra vs Claude Opus 4.8
OpenAI vs Anthropic
See comparisonAlternatives
GPT-5.6 Terra alternatives
Similar models worth considering, and where each one has the edge.
OpenAI
GPT-6 Sol
OpenAI
GPT-5.6 Sol
Z.ai
GLM 5.3
Want to learn about other models? Browse all models
FAQ
Frequently asked questions
How much does GPT-5.6 Terra cost?
GPT-5.6 Terra costs $2 per 1M input tokens and $12 per 1M output tokens through the API. A typical chat message costs about $10 per 1,000 messages.
What is the context window of GPT-5.6 Terra?
GPT-5.6 Terra accepts up to 1.05M tokens of input and can write up to 128K tokens in a single response.
What is the best alternative to GPT-5.6 Terra?
GPT-6 Sol from OpenAI is a strong alternative. It offers: 1.2x cheaper output, higher intelligence score, newer release.
Can I use GPT-5.6 Terra alongside other models?
Yes. Shortcut Chat sends one prompt to GPT-5.6 Terra and any other models you pick at the same time, so you can compare answers side by side.
Try GPT-5.6 Terra next to every other model.
Use GPT-5.6 Terra alongside all the other models. Use one at a time, or multiple together. Get the best answer from every AI.