Ways to buy 5
| Way to buy | Input | Output | In / out per 1M | Cached | Vs list |
|---|---|---|---|---|---|
 OpenAIflex, cheapest · cached $0.1 | $1 | $5 | $1 / $5-50% vs list | $0.1 | -50% vs list |
| OpenAI API The lab's own API · cached $0.2 | $2 | $10 | $2 / $10List price | $0.2 | List price |
 Azure AI FoundryDefault region · cached $0.4 | $4 | $20 | $4 / $20+100% vs list | $0.4 | +100% vs list |
| OpenAI fast · cached $0.4 | $4 | $20 | $4 / $20+100% vs list | $0.4 | +100% vs list |
| Azure AI Foundry eu · cached $0.44 | $4.4 | $22 | $4.4 / $22+120% vs list | $0.44 | +120% vs list |
USD per 1M tokens; batch $1 in, $5 out on the lab's API. Regions are separate routes.
Through a gateway
Your own numbers100M input and 20M output tokens a month: $400.00 direct.
Helicone$400.00+0%
Kong AI Gateway$400.00+0%
LiteLLM$400.00+0%
Vercel AI Gateway$400.00+0%
Cloudflare AI Gateway$420.00+5%
Requesty$420.00+5%
Eden AI$422.00+5.5%
OpenRouter$422.00+5.5%
No published token fee: Martian Gateway, Portkey, TrueFoundry AI Gateway.
Related models
| In / out per 1M | Cheapest route | ||||||
|---|---|---|---|---|---|---|---|
| GPT-6 Luna OpenAI · 1.05MCheapest: $0.1 on OpenAI (flex) | $0.1 | $0.5 | $0.1 / $0.5 | $0.2 | 1.05M | $0.1 on OpenAI (flex) | · |
| GPT-6 Luna Pro OpenAI · 1.05MCheapest: $0.1 on OpenAI (flex) | $0.1 | $0.5 | $0.1 / $0.5 | $0.2 | 1.05M | $0.1 on OpenAI (flex) | · |
| GPT-6 Sol OpenAI · 1.05MCheapest: $2 on OpenAI (flex) | $2 | $10 | $2 / $10 | $4 | 1.05M | $2 on OpenAI (flex) | · |
| GPT-6 Sol Pro OpenAI · 1.05MCheapest: $2 on OpenAI (flex) | $2 | $10 | $2 / $10 | $4 | 1.05M | $2 on OpenAI (flex) | · |
 Claude Opus 5.5Anthropic · 1M | $4 | $20 | $4 / $20 | $8 | 1M | Lab list price | · |
 Muse Spark 1.3Meta · 1M | $1.25 | $4.25 | $1.25 / $4.25 | $2 | 1M | Lab list price | · |
 Gemini 3.1 Pro PreviewGoogle · 1MCheapest: $2.25 on Google Vertex AI (global-flex) | $2 | $12 | $2 / $12 | $4.5 | 1M | $2.25 on Google Vertex AI (global-flex) | · |
| Muse Spark 1.1 Meta · 1M | $1.25 | $4.25 | $1.25 / $4.25 | $2 | 1M | Lab list price | · |
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.
Takes files, image, text in and returns text. First listed Jul 17, 2026. Up to 128K output tokens. Blended price $4 per 1M tokens at 3 input to 1 output. Model id gpt-5-6-sol-pro.
Price history
List price since Jul 17, 2026, from Internet Archive snapshots of the OpenRouter catalog, then daily reads.
| Seen | Model | Old price | New price | Change |
|---|---|---|---|---|
| Aug 24, 2026 | GPT-5.6 Sol ProInput $2.5 to $2, Output $15 to $10, Cached input $0.25 to $0.2 | Input $2.5Output $15Cached input $0.25 | Input $2Output $10Cached input $0.2 | -20% |
| Aug 21, 2026 | GPT-5.6 Sol ProInput $5 to $2.5, Output $30 to $15, Cached input $0.5 to $0.25 | Input $5Output $30Cached input $0.5 | Input $2.5Output $15Cached input $0.25 | -50% |
Questions
How much does GPT-5.6 Sol Pro cost?
$2 per million input tokens and $10 per million output tokens, with cached input at $0.2, or $1 and $5 through the Batch API.
What is the context window of GPT-5.6 Sol Pro?
1.05M tokens, with up to 128K tokens of output.
Where is GPT-5.6 Sol Pro cheapest?
Of 5 routes tracked, OpenAI is cheapest at $1 input and $5 output per million tokens.
Has GPT-5.6 Sol Pro's price changed?
Yes. The output price went from $15 to $10, first seen Aug 24, 2026.
Sources: OpenRouter's public model catalog and each provider's own pricing page, read every morning at 05:00 UTC; gateway fees re-read every Monday. List prices: your contract may differ. Logos via logo.dev; trademarks belong to their owners.