meta
GPT-5.6 Terra vs Muse Spark 1.2
78.0 overall · $2.00 / 1M
// openai
GPT-5.6 Terra
openai/gpt-5.6-terra
reasoningtool callingfile inputimage inputprompt caching
GPT-5.6 Terra costs $2.00 per 1M input tokens and $12.00 per 1M output tokens with a 1.1M-token context window.
A reasoning, tool-calling model from openai, released Jul 9, 2026. On LiveBench it scores 77.9 overall — #16 of 55 benchmarked models — and ranks highest in reasoning (#7).
- Input / 1M
- $2.00
- Output / 1M
- $12.00
- Context
- 1.1M
- LiveBench overall
- 77.9 · #16
Specs and pricing
| Input price USD per 1M prompt tokens | $2.00 |
|---|---|
| Output price USD per 1M completion tokens, reasoning included | $12.00 |
| Blended price 3:1 input:output — #41 most expensive of 343 listed models | $4.50 |
| Cached input read Blank means not priced separately — not free | $0.200 |
| Cache write | $2.50 |
| Context window | 1,050,000 tokens |
| Max output | 128,000 tokens |
| Input modalities | file, image, text |
| Tool calling | Yes |
| Extended reasoning | Yes |
| Knowledge cutoff | 2026-02-16 |
| Listed | Jul 9, 2026 |
Also listed as openai/gpt-5.6-terra:batch ($2.25 blended)— the same model at a different price or rate limit.
Benchmarks by category
LiveBench scores out of 100, with GPT-5.6 Terra's rank among the 55 benchmarked models listed here. Run: gpt-5.6-terra-max.
Language#17 of 55
82.9
$0.1046 measured per point
What GPT-5.6 Terra costs to run
Monthly list cost across five workload shapes, using the published cached-input rate where there is one. A floor, not a quote — batch discounts and cache writes aren't included.
| Workload | Per month |
|---|---|
| Support chatbot 1.2K in / 400 out × 200K requests | $1,310/mo |
| RAG assistant 8K in / 600 out × 100K requests | $1,600/mo |
| Coding agent 40K in / 4K out × 20K requests | $1,552/mo |
| Document extraction 20K in / 1.5K out × 50K requests | $2,810/mo |
| Bulk classification 500 in / 20 out × 5M requests | $5,300/mo |
Compare GPT-5.6 Terra with
The benchmarked models closest to it on overall score.
openai
GPT-5.6 Terra vs GPT-5.4
78.0 overall · $5.63 / 1M
x-ai
GPT-5.6 Terra vs SpaceXAI: Grok 4.6
78.0 overall · $3.00 / 1M
deepseek
GPT-5.6 Terra vs DeepSeek V4 Pro 0813
77.4 overall · $0.990 / 1M
x-ai
GPT-5.6 Terra vs SpaceXAI: Grok 4.7
77.4 overall · $2.40 / 1M
GPT-5.6 Terra vs Gemini 3.7 Flash
78.8 overall · $1.50 / 1M
GPT-5.6 Terra FAQ
How much does GPT-5.6 Terra cost?
GPT-5.6 Terra lists at $2.00 per 1M input tokens and $12.00 per 1M output tokens, with cached input reads at $0.200 per 1M. A RAG assistant handling 100K requests a month (8K tokens in, 600 out) comes to about $1,600 at list price.
What is the context window of GPT-5.6 Terra?
GPT-5.6 Terra accepts up to 1,050,000 tokens of context and can return up to 128,000 output tokens per response.
Does GPT-5.6 Terra support tool calling?
Yes — GPT-5.6 Terra supports tool (function) calling and exposes extended reasoning. It accepts file, image, text input.
How does GPT-5.6 Terra score on benchmarks?
On LiveBench release 2026-06-25 (run: gpt-5.6-terra-max), GPT-5.6 Terra scores 77.9 overall, ranking #16 of 55 benchmarked models.
What is the API model ID for GPT-5.6 Terra?
On OpenRouter the model ID is "openai/gpt-5.6-terra". It was listed on Jul 9, 2026.
More from openai
How these numbers are produced
- Price and specs — provider list data from OpenRouter, refreshed every 15 minutes. “Blended” is a 3:1 input:output mix.
- Scores and ranks — LiveBench release 2026-06-25. Ranks count only models that have a published run; a blank means “not evaluated”, never “bad”.
- Cost per point — the measured dollars LiveBench spent on the run, divided by the score it earned.
Published benchmarks rank models on someone else's tasks. Before committing, see LLM & agent evaluation for building an eval on your own.