Model comparison
GPT-5.6 Terra vs Grok 4.6
Compare GPT-5.6 Terra vs Grok 4.6 API pricing: input/output token costs, cache pricing, context windows, workload estimates, and routing fit.
GPT-5.6 Terra
openai · gpt-5.6-terra
- Input
- $2
- Output
- $12
- Context
- 1.1M
Grok 4.6
xai · grok-4.6
- Input
- $2
- Output
- $6
- Context
- 500K
Quick take
GPT-5.6 Terra has the lower input price at $2 per 1M input tokens. Grok 4.6 is cheaper for the example blended workload below. GPT-5.6 Terra has the larger context window at 1.1M tokens.
Choose GPT-5.6 Terra if...
- GPT-5.6 Terra is safer for long documents, repository analysis, and RAG prompts because it has the larger context window.
- GPT-5.6 Terra gives more room for long generated answers, reports, or code output.
Choose Grok 4.6 if...
- Grok 4.6 is the better default for cost-sensitive traffic and repeated high-volume calls.
Example workload cost
Estimates use input tokens plus 20% output tokens. They exclude provider discounts, cache hits, and tool/search surcharges.
| Workload | GPT-5.6 Terra | Grok 4.6 | Cheaper |
|---|---|---|---|
| 1M input + 200K output | $4.40 | $3.20 | Grok 4.6 |
| 10M input + 2M output | $44.00 | $32.00 | Grok 4.6 |
| 100M input + 20M output | $440.00 | $320.00 | Grok 4.6 |
Context, output, and capability fit
GPT-5.6 Terra provides the larger context window. Check max output separately when the task needs long reports, code generation, or full-document rewrites.
- GPT-5.6 Terra max output
- 128K
- Grok 4.6 max output
- n/a
- GPT-5.6 Terra features
- prompt caching, function calling, vision
- Grok 4.6 features
- prompt caching, function calling, vision
Risk notes for GPT-5.6 Terra
- No major capability risk is flagged in this snapshot, but provider pages should still be verified before production routing.
Risk notes for Grok 4.6
- No major capability risk is flagged in this snapshot, but provider pages should still be verified before production routing.
Routing tags
frontierreasoningcodingagentslong-contextmultimodalcache-friendlyrag