Decision summary
- New Sol work -> GPT-6.1 Sol
- Existing gpt-6-sol route -> this card's $2 / $10 rates
- Pinned gpt-5.6-sol -> replay before you cut over
- Above 272K input tokens -> price the full request from each card
- Need Astra -> do not stop at Sol
OpenAI Sol successor comparison
Frontier comparisonGPT-6 Sol vs GPT-5.6 Sol
GPT-6 Sol (gpt-6-sol) and GPT-5.6 Sol (gpt-5.6-sol) are both still documented OpenAI API models.
Featured · Updated 7 days ago · Last verified: October 2026
Choose GPT-6 Sol when
An existing gpt-6-sol route. New Sol work is documented on GPT-6.1 Sol.
Choose GPT-5.6 Sol when
A deployment that is still pinned to gpt-5.6-sol.
- New Sol work: GPT-6.1 Sol
- Existing gpt-6-sol route: this card's $2 / $10 rates
- Pinned gpt-5.6-sol: replay before you cut over
Decision axes: Best for · Access and platforms · Context window · Input and output
Reasoning
Both cards list none through max, default medium.
Coding
GPT-6 Sol is the September Sol ID. GPT-6.1 Sol is the newer Sol model named on that card. No score table is published.
Multimodal
Text and image in, text out, on both cards.
Speed
GPT-6 Sol Fast mode is 2× Standard. Do not copy that rate onto GPT-5.6 Sol.
Enterprise
Both IDs remain on the model cards. A pin is a deployment choice, not a quality ranking.
Curated matrix for GPT-6 Sol vs GPT-5.6 Sol — confirm live limits and pricing on each vendor’s official pages.
How they compare
Criterion-by-criterion notes from the catalog—not a ranking. Validate on your own gold set.
| Criterion | GPT-6 Sol | GPT-5.6 Sol |
|---|---|---|
| Best for | An existing gpt-6-sol route. New Sol work is documented on GPT-6.1 Sol. | A deployment that is still pinned to gpt-5.6-sol. |
| Access and platforms | API ID gpt-6-sol. The model card points to gpt-6.1-sol as the newer Sol model. | API ID gpt-5.6-sol. The gpt-5.6 alias routes to this model. |
| Context window | 1,050,000 context, 922,000 max input, 128,000 max output. Knowledge cutoff April 20, 2026. | 1,050,000 context, 922,000 max input, 128,000 max output. Knowledge cutoff February 16, 2026. |
| Input and output | Text and image in; text out. | Text and image in; text out. |
| Reasoning control | none, low, medium (default), high, xhigh, and max. Chat Completions function calling only at none. | none, low, medium (default), high, xhigh, and max. |
| Coding and agents | Built for complex coding and agentic workflows. Responses API for built-in tools. | The prior Sol ID. Daybreak Blue's October 30 overview still names it for reduced refusals. |
| Cost posture | $2 input / $0.20 cached / $2.50 cache write / $10 output per million. Above 272K input tokens: 2× input and cache, and 1.5× output, for the full request. Fast mode is 2×. Regional processing adds 10%. | $4 input / $0.40 cached / $20 output per million. Cache writes are 1.25× uncached input. Above 272K input tokens: 2× input and 1.5× output for the full request. Promotional pricing lasts at least through November 21, 2026. |
| Operational risk | Replay a pinned eval before you leave gpt-5.6-sol. Do not treat the sticker gap as a quality score. | Staying pinned avoids a migration and keeps the higher list price until the promo date. |
Key insights
Concrete technical or product signals.
- Short-context stickers are $2/$10 versus $4/$20. GPT-5.6 Sol's card says that promotional pricing lasts at least through November 21, 2026.
- Above 272K input tokens, GPT-6 Sol charges 2× input and cache and 1.5× output for the whole request. GPT-5.6 Sol's card charges 2× input and 1.5× output. It does not say the cache rate doubles.
- Cached input is $0.20 on GPT-6 Sol and $0.40 on GPT-5.6 Sol. GPT-6 Sol lists cache writes at $2.50. GPT-5.6 Sol states cache writes at 1.25× the uncached input rate.
Use cases
Where this shines in production.
- Comparing gpt-6-sol with a pinned gpt-5.6-sol deployment
- Pricing a request that crosses 272K input tokens
- Seeing that new Sol work is documented on GPT-6.1 Sol
Limitations & trade-offs
What to watch for.
- This page is not GPT-6 Sol versus GPT-6.1 Sol, and it is not Sol versus Astra or Luna.
- No quality scores are published on these two cards, so none are stated.
- Daybreak Blue's October 30 overview names both models. Project enablement is still separate, and GPT-6.1 Sol follows a different access rule.
Watch-outs
Who should pass, and what to validate before rollout.
- Do not treat $2/$10 as proof that GPT-6 Sol matches GPT-5.6 Sol on your eval.
- Do not apply GPT-6 Sol's doubled cache rate to GPT-5.6 Sol.
- Do not open a new Sol route on gpt-5.6-sol.
Final recommendation
What to do after reading the table.
Use GPT-6.1 Sol for a new Sol route. Keep gpt-5.6-sol where the replay has not passed, and keep gpt-6-sol where that ID is already the pin.
FAQ
Is GPT-6 Sol better than GPT-5.6 Sol?
Use GPT-6.1 Sol for a new Sol route. Keep gpt-5.6-sol where the replay has not passed, and keep gpt-6-sol where that ID is already the pin.
Which is better for coding: GPT-6 Sol or GPT-5.6 Sol?
GPT-6 Sol: Built for complex coding and agentic workflows. Responses API for built-in tools. GPT-5.6 Sol: The prior Sol ID. Daybreak Blue's October 30 overview still names it for reduced refusals. The catalog does not declare a winner on coding and agents.
Which is cheaper: GPT-6 Sol or GPT-5.6 Sol?
Listed unit prices: GPT-6 Sol $2 input / $0.20 cached / $2.50 cache write / $10 output per million. Above 272K input tokens: 2× input and cache, and 1.5× output, for the; GPT-5.6 Sol $4 input / $0.40 cached / $20 output per million. Cache writes are 1.25× uncached input. Above 272K input tokens: 2× input and 1.5× output. A lower listed unit price is not the same as a lower total workload cost—tokens, session minutes, caching, introductory rates, and add-on modes can reverse the ranking. Confirm live rates on each vendor’s official page.
Can I use both GPT-6 Sol and GPT-5.6 Sol?
Yes. Many teams keep both and route by constraint. Use GPT-6 Sol for An existing gpt-6-sol route. New Sol work is documented on GPT-6.1 Sol, and GPT-5.6 Sol for A deployment that is still pinned to gpt-5.6-sol. Confirm vendor terms before mixing them in one production workflow.