# GPT-5.6 Sol vs GPT-6 Sol

As of November 10, 2026, GPT-5.6 Sol costs 100% more per input token than GPT-6 Sol ($4.00 vs $2.00 per 1M), and both have a 922K-token context window.

- Page: https://models.litellm.ai/compare/gpt-5.6-sol-vs-gpt-6-sol
- GPT-5.6 Sol: https://models.litellm.ai/models/gpt-5.6-sol
- GPT-6 Sol: https://models.litellm.ai/models/gpt-6-sol

## Side by side

| | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| Input, per 1M tokens | $4.00 | $2.00 |
| Output, per 1M tokens | $20.00 | $10.00 |
| Cache read, per 1M tokens | $0.40 | $0.20 |
| Cache write, per 1M tokens | $5.00 | $2.50 |
| Context window | 922,000 tokens | 922,000 tokens |
| Max output | 128,000 tokens | 128,000 tokens |
| Image input | Yes | Yes |
| Tool calling | Yes | Yes |
| Structured output (JSON) | Yes | Yes |
| Prompt caching | Yes | Yes |
| Reasoning | Yes | Yes |
| Providers on LiteLLM | 10 | 10 |
| Price shown is from | OpenAI | OpenAI |
| Added to LiteLLM | July 9, 2026 | September 22, 2026 |

Headline prices in USD per 1M tokens, from LiteLLM's model price file.

## Cheapest provider for each

- GPT-5.6 Sol: OpenAI at $4.00 input per 1M tokens (`gpt-5.6-sol`)
- GPT-6 Sol: Databricks at $2.00 input per 1M tokens (`databricks/databricks-gpt-6-sol`)

## Benchmark scores

| Benchmark | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| Epoch Capabilities Index (Overall) | 163.0 | 164.0 |
| FrontierCode (Coding and agents) | 47.5% | 49.3% (max) |
| APEX-Agents (Coding and agents) | 51.4% (promax) | 54.3% (max) |
| GPQA Diamond (Reasoning and knowledge) | 93.5% (max) | 94.3% (max) |
| ARC-AGI-2 (Reasoning and knowledge) | 92.5% (max) | 89.6% (max) |
| SimpleQA Verified (Reasoning and knowledge) | 69.7% (max) | 60.7% (max) |
| FrontierMath (tiers 1-3) (Math) | 89.1% (max) | 89.8% (max) |
| FrontierMath (tier 4) (Math) | 82.9% (max) | 90.0% (max) |
| OTIS Mock AIME 2024-2025 (Math) | 100.0% (max) | 100.0% (max) |

From the Epoch AI Benchmarking Hub (https://epoch.ai/benchmarks), CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), data as of September 22, 2026: Epoch's own runs and results it collects from each benchmark's leaderboard. Higher is better.

## When to pick which

- GPT-6 Sol: Costs 50% less per input token: $2.00 vs $4.00 per 1M.

## FAQ

### Which is cheaper, GPT-5.6 Sol or GPT-6 Sol?

GPT-6 Sol is cheaper at 3 input tokens per output token: $4.00 per 1M tokens blended ($2.00 input, $10.00 output), versus $8.00 ($4.00 and $20.00) for GPT-5.6 Sol, as of November 10, 2026.

### Which has the larger context window, GPT-5.6 Sol or GPT-6 Sol?

Both have a 922,000-token context window.

### Can I switch from GPT-5.6 Sol to GPT-6 Sol without changing my code?

Yes. Through LiteLLM both use the OpenAI format, so switching means changing the model name from "gpt-5.6-sol" to "gpt-6-sol", or pointing a LiteLLM gateway model alias at the other model. You can also use one as a fallback for the other.