# GPT-5.6 Sol vs GPT-5.6 Terra

> Markdown mirror of https://router.one/models/compare/gpt-5-6-sol-vs-gpt-5-6-terra for AI assistants and crawlers. Router One is an OpenAI-compatible LLM API gateway.

GPT-5.6 Sol 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.

## GPT-5.6 Sol vs GPT-5.6 Terra: rates, context window, and capabilities

| Spec | GPT-5.6 Sol | GPT-5.6 Terra |
| --- | --- | --- |
| Input / 1M tokens | $0.50 | $0.25 |
| Output / 1M tokens | $4.00 | $1.50 |
| Cached input / 1M tokens | $0.25 | $0.13 |
| Context window | 1.1M | 1.1M |
| Capabilities | Chat, Streaming, Tool calling, Vision | Chat, Streaming, Tool calling, Vision |
| Detail page | [GPT-5.6 Sol](https://router.one/models/gpt-5-6-sol) | [GPT-5.6 Terra](https://router.one/models/gpt-5-6-terra) |

## What does 1M tokens cost on GPT-5.6 Sol vs GPT-5.6 Terra?

For a workload of 1M input plus 1M output tokens at current rates: GPT-5.6 Sol comes to $4.50, GPT-5.6 Terra comes to $1.75 — GPT-5.6 Terra is about 61% 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 GPT-5.6 Sol 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:

`compare.sh`

```bash
curl https://api.router.one/v1/chat/completions \
  -H "Authorization: Bearer sk-your-router-one-key" \
  -H "Content-Type: application/json" \
  -d '{"model": "openai/gpt-5.6-sol", "messages": [{"role": "user", "content": "Hello"}]}'

# Same request, other model — change one string:
#   "model": "openai/gpt-5.6-terra"
```

## FAQ

### Is GPT-5.6 Sol cheaper than GPT-5.6 Terra?

At current posted rates, GPT-5.6 Terra is the cheaper of the two (input $0.50 vs $0.25, output $4.00 vs $1.50 per 1M tokens). Rates change; the /models page is the live source of truth.

### Can I switch between GPT-5.6 Sol 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.

## More comparisons

- [Claude Opus 5 vs GPT-5.6 Sol](https://router.one/models/compare/claude-opus-5-vs-gpt-5-6-sol)
- [GPT-5.6 Sol vs GPT-5.5](https://router.one/models/compare/gpt-5-6-sol-vs-gpt-5-5)
- [Claude Fable 5 vs GPT-5.6 Sol](https://router.one/models/compare/claude-fable-5-vs-gpt-5-6-sol)
- [Grok 4.6 vs GPT-5.6 Sol](https://router.one/models/compare/grok-4-6-vs-gpt-5-6-sol)

All model comparisons: https://router.one/models/compare

## See also

- Canonical page: https://router.one/models/compare/gpt-5-6-sol-vs-gpt-5-6-terra
- All models & prices: https://router.one/models (markdown: https://router.one/models.md)
- Pricing: https://router.one/pricing