High-volume, cost-sensitive work
Choose GPT-5.6 Sol
GPT-5.6 Sol costs 29% less on a typical mix of three input tokens for every output token ($8.00 against $11.25 per million tokens).
Chat Latest vs GPT-5.6 Sol: price, context and capabilities
Choose Chat Latest for the most recent knowledge. Choose GPT-5.6 Sol for high-volume, cost-sensitive work, writing and code generation, reused prompts and documents (RAG, agents), very long inputs and the latest release.
In short
- GPT-5.6 Sol is 29% cheaper than Chat Latest at the headline price ($8.00 / 1M tokens vs $11.25 / 1M tokens).
- GPT-5.6 Sol reads more per request: 1.05M tokens against 400k.
- GPT-5.6 Sol is the newer model (Jul 9, 2026, against May 5, 2026).
- Only GPT-5.6 Sol offers reasoning.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose GPT-5.6 Sol
GPT-5.6 Sol charges $20.00 per million output tokens, against $30.00 for Chat Latest. Output dominates the bill when answers are long.
Reused prompts and documents (RAG, agents)
Choose GPT-5.6 Sol
GPT-5.6 Sol charges $0.40 per million cached input tokens, against $0.50 for Chat Latest.
Very long inputs
Choose GPT-5.6 Sol
GPT-5.6 Sol reads up to 1.05M tokens per request, against 400k for Chat Latest.
Latest release
Choose GPT-5.6 Sol
GPT-5.6 Sol is the newer release (Jul 9, 2026, against May 5, 2026 for Chat Latest).
Most recent knowledge
Choose Chat Latest
Chat Latest was trained on data up to April 2026, against February 2026 for GPT-5.6 Sol.
Monthly cost at three volumes
| Volume | Chat Latest | GPT-5.6 Sol | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $12.50 | $9.00 | GPT-5.6 Sol, $3.50 less |
| Production: 20M input, 5M output tokens | $250.00 | $180.00 | GPT-5.6 Sol, $70.00 less |
| Scale: 500M input, 100M output tokens | $5,500 | $4,000 | GPT-5.6 Sol, $1,500 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| Chat Latest | GPT-5.6 Sol | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Category | Language models | Language models |
| Status | Generally available | Generally available |
| Headline price | $11.25 / 1M tokens | $8.00 / 1M tokens |
| Input | $5.00 / 1M tokens | $4.00 / 1M tokens |
| Output | $30.00 / 1M tokens | $20.00 / 1M tokens |
| Cached input | $0.50 / 1M tokens | $0.40 / 1M tokens |
| Context window | 400k | 1.05M |
| Max output | 128k | 128k |
| Released | May 5, 2026 | Jul 9, 2026 |
| Knowledge cutoff | April 2026 | February 2026 |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API |
| API model id | chat-latest | gpt-5.6-sol |
Benchmarks side by side
Leader in bold.
| Benchmark | Chat Latest | GPT-5.6 Sol |
|---|---|---|
| Intelligence Index | No data | 47 |
| Terminal-Bench Hard | No data | 65.9% |
| SciCode | No data | 57.1% |
| GPQA Diamond | No data | 94.1% |
| Humanity's Last Exam | No data | 49.5% |
| IFBench (instruction following) | No data | 72.7% |
| τ²-Bench (agentic tool use) | No data | 85.1% |
| MMMU-Pro (visual reasoning) | No data | 83.4% |
| Long-context reasoning (AA-LCR) | No data | 84% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose Chat Latest or GPT-5.6 Sol?
Choose Chat Latest for the most recent knowledge. Choose GPT-5.6 Sol for high-volume, cost-sensitive work, writing and code generation, reused prompts and documents (RAG, agents), very long inputs and the latest release.
Which is cheaper, Chat Latest or GPT-5.6 Sol?
GPT-5.6 Sol is 29% cheaper than Chat Latest at the headline price ($8.00 / 1M tokens vs $11.25 / 1M tokens).
Which has the larger context window, Chat Latest or GPT-5.6 Sol?
GPT-5.6 Sol reads more per request: 1.05M tokens against 400k.
What is the difference between Chat Latest and GPT-5.6 Sol?
Chat Latest is made by OpenAI and GPT-5.6 Sol by OpenAI. GPT-5.6 Sol is 29% cheaper than Chat Latest at the headline price ($8.00 / 1M tokens vs $11.25 / 1M tokens). GPT-5.6 Sol reads more per request: 1.05M tokens against 400k. GPT-5.6 Sol is the newer model (Jul 9, 2026, against May 5, 2026). Only GPT-5.6 Sol offers reasoning.
How much do Chat Latest and GPT-5.6 Sol cost per month?
At 20 million input and 5 million output tokens a month, Chat Latest costs $250.00 and GPT-5.6 Sol costs $180.00, at standard rates.
Which is newer, Chat Latest or GPT-5.6 Sol?
GPT-5.6 Sol was released on Jul 9, 2026 and Chat Latest on May 5, 2026.