---
id: "64"
slug: "gpt-5-6-models"
date: "2026-07-09"
title: "GPT-5.6 Sol, Terra & Luna Now Available"
summary: "OpenAI's new GPT-5.6 family is live on LLM Gateway from day one: Sol for frontier reasoning at $5/$30 per 1M tokens, Terra balancing intelligence and cost at $2.50/$15, and Luna for high-volume workloads at $1/$6 — all with a 1.05M-token context window, reasoning, vision, tool calling, and web search."
image:
  src: "/changelog/gpt-5-6-models.png"
  alt: "GPT-5.6 Sol, Terra, and Luna models now available on LLM Gateway"
  width: 1536
  height: 1024
---

Picking an OpenAI model used to mean trading capability against cost across scattered version numbers. The new **GPT-5.6** family makes the trade-off explicit — three models, one lineup — and all three are available on LLM Gateway today, the day OpenAI released them.

## Three Models, One Family

| Model           | Best for                                             | Input / 1M | Cached input / 1M | Output / 1M |
| --------------- | ---------------------------------------------------- | ---------- | ----------------- | ----------- |
| `gpt-5.6-sol`   | Frontier reasoning and complex professional work     | $5.00      | $0.50             | $30.00      |
| `gpt-5.6-terra` | Balanced intelligence and cost                       | $2.50      | $0.25             | $15.00      |
| `gpt-5.6-luna`  | High-volume tasks like classification and extraction | $1.00      | $0.10             | $6.00       |

Every model in the family shares the same capabilities:

- **Context window**: 1,050,000 tokens, with 128,000 max output tokens
- **Knowledge cutoff**: February 16, 2026
- Reasoning, vision, tool calling, web search, and structured outputs
- **Flex** (50% cheaper) and **Priority** (2x, low-latency) service tiers

## Getting Started

All three models work through the unified API right now:

```bash
curl -X POST https://api.llmgateway.io/v1/chat/completions \
  -H "Authorization: Bearer $LLM_GATEWAY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.6-sol",
    "messages": [{"role": "user", "content": "Hello GPT-5.6!"}]
  }'
```

Swap `gpt-5.6-sol` for `gpt-5.6-terra` or `gpt-5.6-luna` to move down the cost curve without touching anything else in your integration. Available on all plans.

---

**[Browse the models →](https://llmgateway.io/models)** | **[Quick start →](https://docs.llmgateway.io)**
