OpenAI: GPT-5.6 Sol Pro
by OpenAIOpenAI: GPT-5.6 Sol Pro is a large language model from OpenAI. It costs $2.00 per million input tokens and $10.00 per million output tokens. Its context window is 1.1M tokens.
- Input / 1M tokens
- $2.00
- Output / 1M tokens
- $10.00
- Cached input / 1M
- $0.200
- Context window
- 1.1M
On repeated prefixes
tokens
This model also charges $0.01 per search request
That is $10.00 per 1,000 requests, billed on top of the token prices above. On a typical 1,000-in / 500-out exchange the tokens cost $0.007, so the search fee is 1.4× the token cost. Per-token rankings elsewhere ignore this entirely.
Who serves it cheapest
2 hosts serve GPT-5.6 Sol Pro. Same weights, same API - the price difference is pure margin and routing.
| Provider | Input / 1M | Output / 1M | Context | Throughput | Uptime 24h |
|---|---|---|---|---|---|
| OpenAICheapest | $1.00 | $5.00 | 1.1M | - | 92.2% |
| Azure | $5.00 | $30.00 | 1.1M | - | 100.0% |
The spread between OpenAI and Azure is 5.6× for identical weights. Quantization and context limits differ, so check both columns before switching.
About GPT-5.6 Sol Pro
GPT-5.6 Sol Pro is the same underlying model as [GPT-5.6 Sol](https://openrouter.ai/openai/gpt-5.6-sol), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode
Specifications
| Model ID | openai/gpt-5.6-sol-pro |
|---|---|
| Provider | OpenAI |
| Context window | 1.1M tokens |
| Max output | 128K tokens |
| Input modalities | file, image, text |
| Output modalities | text |
| Knowledge cutoff | 2026-02-16 |
| Open weights | No |
| Released | July 9, 2026 |
Cheaper alternatives
Models that cost less than GPT-5.6 Sol Pro while keeping at least half its context window and every input modality it supports.
Frequently asked
How much does OpenAI: GPT-5.6 Sol Pro cost?
$2.00 per million input tokens and $10.00 per million output tokens. Cached input reads cost $0.200 per million tokens.
What is the context window of OpenAI: GPT-5.6 Sol Pro?
1.1M tokens, with up to 128K tokens of output per request.
Does OpenAI: GPT-5.6 Sol Pro have extra fees beyond per-token pricing?
Yes. OpenAI: GPT-5.6 Sol Pro charges $0.01 per search request - $10.00 per 1,000 requests - on top of $2.00 per million input tokens and $10.00 per million output tokens. On a typical 1,000-input / 500-output exchange the search fee alone is 1.4× the token cost.
Which provider serves OpenAI: GPT-5.6 Sol Pro cheapest?
OpenAI at $1.00 per million input tokens - 5.6× cheaper than Azure, the most expensive of the 2 hosts serving it.
Confirm against the source: OpenAI official pricing.