High-volume, cost-sensitive work
Choose GPT-6.1 Sol Pro
GPT-6.1 Sol Pro costs 11% less on a typical mix of three input tokens for every output token ($4.00 against $4.50 per million tokens).
Gemini 3.1 Pro vs GPT-6.1 Sol Pro: price, context and capabilities
Choose GPT-6.1 Sol Pro for high-volume, cost-sensitive work, writing and code generation, reused prompts and documents (RAG, agents) and the latest release; on the other points the two are level or the data is missing.
In short
- GPT-6.1 Sol Pro is 11% cheaper than Gemini 3.1 Pro at the headline price ($4.00 / 1M tokens vs $4.50 / 1M tokens).
- GPT-6.1 Sol Pro reads more per request: 1.05M tokens against 1.05M.
- GPT-6.1 Sol Pro is the newer model (Sep 29, 2026, against February 2026).
- Only Gemini 3.1 Pro offers batch api.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose GPT-6.1 Sol Pro
GPT-6.1 Sol Pro charges $10.00 per million output tokens, against $12.00 for Gemini 3.1 Pro. Output dominates the bill when answers are long.
Reused prompts and documents (RAG, agents)
Choose GPT-6.1 Sol Pro
GPT-6.1 Sol Pro charges $0.10 per million cached input tokens, against $0.20 for Gemini 3.1 Pro.
Latest release
Choose GPT-6.1 Sol Pro
GPT-6.1 Sol Pro is the newer release (Sep 29, 2026, against February 2026 for Gemini 3.1 Pro).
Monthly cost at three volumes
| Volume | Gemini 3.1 Pro | GPT-6.1 Sol Pro | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $5.00 | $4.50 | GPT-6.1 Sol Pro, $0.50 less |
| Production: 20M input, 5M output tokens | $100.00 | $90.00 | GPT-6.1 Sol Pro, $10.00 less |
| Scale: 500M input, 100M output tokens | $2,200 | $2,000 | GPT-6.1 Sol Pro, $200.00 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| Gemini 3.1 Pro | GPT-6.1 Sol Pro | |
|---|---|---|
| Provider | OpenAI | |
| Category | Language models | Language models |
| Status | Preview | Generally available |
| Headline price | $4.50 / 1M tokens | $4.00 / 1M tokens |
| Input | $2.00 / 1M tokens | $2.00 / 1M tokens |
| Output | $12.00 / 1M tokens | $10.00 / 1M tokens |
| Cached input | $0.20 / 1M tokens | $0.10 / 1M tokens |
| Context window | 1.05M | 1.05M |
| Max output | 66k | 128k |
| Released | February 2026 | Sep 29, 2026 |
| Knowledge cutoff | No data | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching |
| API model id | gemini-3.1-pro-preview | gpt-6.1-sol-pro |
Benchmarks side by side
Leader in bold.
| Benchmark | Gemini 3.1 Pro | GPT-6.1 Sol Pro |
|---|---|---|
| Intelligence Index | 29.7 | No data |
| Terminal-Bench Hard | 53.8% | No data |
| SciCode | 58.7% | No data |
| GPQA Diamond | 94.1% | No data |
| Humanity's Last Exam | 47% | No data |
| IFBench (instruction following) | 77.1% | No data |
| τ²-Bench (agentic tool use) | 95.6% | No data |
| MMMU-Pro (visual reasoning) | 82.4% | No data |
| Long-context reasoning (AA-LCR) | 82% | No data |
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 Gemini 3.1 Pro or GPT-6.1 Sol Pro?
Choose GPT-6.1 Sol Pro for high-volume, cost-sensitive work, writing and code generation, reused prompts and documents (RAG, agents) and the latest release; on the other points the two are level or the data is missing.
Which is cheaper, Gemini 3.1 Pro or GPT-6.1 Sol Pro?
GPT-6.1 Sol Pro is 11% cheaper than Gemini 3.1 Pro at the headline price ($4.00 / 1M tokens vs $4.50 / 1M tokens).
Which has the larger context window, Gemini 3.1 Pro or GPT-6.1 Sol Pro?
GPT-6.1 Sol Pro reads more per request: 1.05M tokens against 1.05M.
What is the difference between Gemini 3.1 Pro and GPT-6.1 Sol Pro?
Gemini 3.1 Pro is made by Google and GPT-6.1 Sol Pro by OpenAI. GPT-6.1 Sol Pro is 11% cheaper than Gemini 3.1 Pro at the headline price ($4.00 / 1M tokens vs $4.50 / 1M tokens). GPT-6.1 Sol Pro reads more per request: 1.05M tokens against 1.05M. GPT-6.1 Sol Pro is the newer model (Sep 29, 2026, against February 2026). Only Gemini 3.1 Pro offers batch api.
How much do Gemini 3.1 Pro and GPT-6.1 Sol Pro cost per month?
At 20 million input and 5 million output tokens a month, Gemini 3.1 Pro costs $100.00 and GPT-6.1 Sol Pro costs $90.00, at standard rates.
Which is newer, Gemini 3.1 Pro or GPT-6.1 Sol Pro?
GPT-6.1 Sol Pro was released on Sep 29, 2026 and Gemini 3.1 Pro on February 2026.