Grok 4.6 vs GPT-5.6 Terra
Grok 4.6 and GPT-5.6 Terra compared on current per-token rates, context window, and capabilities — both callable through one OpenAI-compatible endpoint with per-request cost traces.
Grok 4.6 vs GPT-5.6 Terra: rates, context window, and capabilities
| Spec | Grok 4.6 | GPT-5.6 Terra |
|---|---|---|
| Input / 1M tokens | $1.10 | $0.25 |
| Output / 1M tokens | $3.30 | $1.50 |
| Cached input / 1M tokens | $0.28 | $0.13 |
| Context window | 500k | 1.1M |
| Capabilities | — | Chat, Streaming, Tool calling, Vision |
| Detail page | Grok 4.6 | GPT-5.6 Terra |
What does 1M tokens cost on Grok 4.6 vs GPT-5.6 Terra?
For a workload of 1M input plus 1M output tokens at current rates: Grok 4.6 comes to $4.40, GPT-5.6 Terra comes to $1.75 — GPT-5.6 Terra is about 60% cheaper on this mix. Real workloads skew heavily toward input tokens, so weigh the input rate by your own ratio; prompt-cache hits bill at the cached-input rate where supported.
Switch between Grok 4.6 and GPT-5.6 Terra without changing code
Both models are behind the same OpenAI-compatible endpoint, so an A/B test is a one-string change — same key, same code, and every request traced with tokens, cost, and latency in the dashboard:
curl https://api.router.one/v1/chat/completions \
-H "Authorization: Bearer sk-your-router-one-key" \
-H "Content-Type: application/json" \
-d '{"model": "grok-4.6", "messages": [{"role": "user", "content": "Hello"}]}'
# Same request, other model — change one string:
# "model": "openai/gpt-5.6-terra"FAQ
Is Grok 4.6 cheaper than GPT-5.6 Terra?
At current posted rates, GPT-5.6 Terra is the cheaper of the two (input $1.10 vs $0.25, output $3.30 vs $1.50 per 1M tokens). Rates change; the /models page is the live source of truth.
Can I switch between Grok 4.6 and GPT-5.6 Terra without changing code?
Yes. Both are served through the same OpenAI-compatible endpoint, so switching is changing the model string in the request — the key, base URL, and request shape stay identical.
Where do these numbers come from?
Specs and prices on this page render from the live Router One catalog — the same data as the /models page — and refresh with it. Pricing methodology is documented on /pricing-methodology.