GPT 5.6 Sol 20% price reduction
Frontier model for complex professional work
Frontier model for complex professional work
GPT-5.6 Sol is the frontier model in the GPT-5.6 family. It roughly
corresponds to the unsuffixed model tier used in earlier GPT-5 families.
The gpt-5.6 alias routes requests to GPT-5.6 Sol.
Reasoning.effort supports: none, low, medium (default), high, xhigh, and max.
128,000
max output tokens
Feb 16, 2026 knowledge cutoff
Pricing
Pricing is based on the number of tokens used, or other metrics based on the model type. For tool-specific models, like search and computer use, there’s a fee per tool call. See details in the
GPT-5.6 Sol costs $4 per million input tokens and $20 per million output tokens, a 20% reduction in input pricing and a 33% reduction in output pricing. GPT-5.6 Sol’s promotional pricing is available at least through November 21, 2026.
Prompts with >272K input tokens are priced at 2x input and 1.5x output for the full request.
Cache writes are billed at 1.25x the uncached input token rate.
Endpoints
Chat Completions
v1/chat/completions
Realtime translation
v1/realtime/translations
Realtime transcription
v1/realtime/transcription_sessions
Fine-tuning
v1/fine-tuning
Image generation
v1/images/generations
Image edit
v1/images/edits
Speech generation
v1/audio/speech
Transcription
v1/audio/transcriptions
Translation
v1/audio/translations
Completions (legacy)
v1/completions
Features
Function calling
Supported
Structured outputs
Supported
Tools
Tools supported by this model when using the Responses API.
Image generation
Supported
Code interpreter
Supported
Snapshots
Snapshots let you lock in a specific version of the model so that performance and behavior remain consistent. Below is a list of all available snapshots and aliases for
GPT-5.6 Sol
.
Rate limits
Rate limits ensure fair and reliable access to the API by placing specific caps on requests, tokens, audio duration, or other usage within a given time period. Your usage tier determines how high these limits are set and automatically increases as you send more requests and spend more on the API.
| Tier | RPM | TPM | Batch queue limit |
|---|---|---|---|
| Free | Not supported | ||
| Tier 1 | 500 | 500,000 | 1,500,000 |
| Tier 2 | 5,000 | 1,000,000 | 3,000,000 |
| Tier 3 | 5,000 | 2,000,000 | 100,000,000 |
| Tier 4 | 10,000 | 4,000,000 | 200,000,000 |
| Tier 5 | 15,000 | 40,000,000 | 15,000,000,000 |