GPT-5.6 Sol (batch)
by OpenAI · openai/gpt-5.6-sol:batch · #299 cheapest of 422 paid models
Prices updated Sep 20, 2026, 12:34 AM UTC · refreshed hourly
GPT-5.6 Sol is the flagship model in OpenAI's GPT-5.6 series. It is suited for complex reasoning, coding, and agentic workflows, and is particularly strong at command-line and multi-step coding tasks...
Compare vs:Claude Sonnet 5Claude Opus 4.6Claude Haiku 4.5Gemini 3.6 Flash
Pricing
Input
$1.00
per 1M tokens
Output
$5.00
per 1M tokens
Blended (3:1)
$2.00
3 input : 1 output
Cache read
$0.10
per 1M cached tokens
Cache write
$1.25
per 1M tokens
Cache & batch economics
Effective prices for GPT-5.6 Sol (batch) with prompt caching.
| Cache hit rate | Effective blended $/1M | Example request* | vs no cache |
|---|---|---|---|
| 0% | $2.00 | $0.107 | — |
| 50% | $1.66 | $0.062 | −42% |
| 90% | $1.39 | $0.026 | −76% |
*Example: 100K sticky context + 2K new input + 1K output. Batch discount is an approximate 50% off list rates for this provider’s batch API. Confirm on the vendor’s pricing page.
What a request costs
| Workload | Input tokens | Output tokens | Cost / request | Cost / 1K requests |
|---|---|---|---|---|
| Short chat message | 500 | 300 | $0.002 | $2.00 |
| Document summary | 8,000 | 1,000 | $0.013 | $13.00 |
| Codebase question (RAG) | 30,000 | 2,000 | $0.04 | $40.00 |
| Long-context analysis | 150,000 | 5,000 | $0.175 | $175.00 |
Performance
Intelligence Index
47
AA composite quality
Coding Index
77.4
Math Index
—
Agentic Index
50.5
Output speed
66 tok/s
median
Time to first token
71.21s
median
Time to first answer
71.21s
after reasoning tokens
Artificial Analysis benchmarks
| Benchmark | Score |
|---|---|
| GPQA Diamond | 94.1% |
| Humanity's Last Exam | 49.5% |
| SciCode | 57.1% |
| IFBench | 72.7% |
| AA-LCR (Long Context Reasoning) | 84.0% |
| Terminal-Bench Hard | 65.9% |
| Terminal-Bench 2.1 | 88.0% |
| τ²-Bench (Telecom) | 85.1% |
| τ³-Bench Banking | 44.3% |
Specs
Context window
1.05M
tokens
Max output
128K
tokens
Input modalities
file, image, text
Tokenizer
GPT