GPT-6 Astra
- Input / 1M tokens
- $10.00
- Output / 1M tokens
- $50.00
API models · Side by side
GPT-6 Astra vs Gemini 3.1 Pro Preview
Compare input formats, context limits and API pricing for two large-context models. Gemini is a preview listing, so version stability is part of the decision.
Gemini 3.1 Pro Preview
- Input / 1M tokens
- $2.00
- Output / 1M tokens
- $12.00
The short answer
- Gemini lists audio and video input in addition to text, images and files. Astra lists text, images and files.
- Base token prices differ substantially. Longer prompts trigger different pricing tiers for each model.
- A context limit describes capacity, not a promise that every answer will use the entire document accurately.
Compare the details
Compare context, supported inputs and usage costs. Highlighted rows show a difference.
| Feature | GPT-6 Astra | Gemini 3.1 Pro Preview |
|---|---|---|
| Input formats | file, image, text | audio, file, image, text, video |
| Output formats | text | text |
| Context / position limit | 1,050,000 | 1,048,576 |
| Maximum output tokens | 128,000 | 65,536 |
| Developer features | Reasoning output, Completion limit, Output limit, Reasoning controls, Thinking effort, Response format, Seed, Structured output, Tool selection, Tool calling, Response length | Reasoning output, Output limit, Reasoning controls, Thinking effort, Response format, Seed, Stop sequences, Structured output, Temperature, Tool selection, Tool calling, Sampling controls |
| Cached input / 1M tokens | $1.00 | $0.20 |
| Cache write / 1M tokens | $12.50 | $0.38 |
| USD input / 1M tokens | $10.00 | $2.00 |
| USD output / 1M tokens | $50.00 | $12.00 |
| Model identifier | openai/gpt-6-astra | google/gemini-3.1-pro-preview |
API pricing
Prices are in USD per million tokens. Input is what you send; output is what the model generates. Claude and ChatGPT subscriptions are billed separately.
GPT-6 Astra: long-prompt rates
- Long-prompt threshold: 272,000 prompt tokens. Input: $20.00 / 1M. Output: $75.00 / 1M.
Gemini 3.1 Pro Preview: long-prompt rates
- Long-prompt threshold: 200,000 prompt tokens. Input: $4.00 / 1M. Output: $18.00 / 1M.
Tools, images and additional reasoning can add charges. The examples below cover input and output tokens only.
Compare local modelsWhat those prices mean in practice
Each example uses the same token budget for both models. These are calculations, not measured workloads. Cache discounts, media, tools and extra reasoning are excluded.
| Workload | GPT-6 Astra | Gemini 3.1 Pro Preview |
|---|---|---|
| 1,000 short requestsPer request: 2,000 input + 500 output tokens | $45.00 | $10.00 |
| 100 document summariesPer request: 20,000 input + 1,000 output tokens | $25.00 | $5.20 |
| 10 long-document requestsPer request: 300,000 input + 2,000 output tokens | $61.50 | $12.36 |
Estimate = requests × (input tokens × input price + output tokens × output price) ÷ 1,000,000. Long-prompt rates are applied where the pricing data provides them. Real requests can use different amounts of output.
Choosing for your project
Start with the formats you need to send, then compare the context allowance and the cost examples. For an existing application, check tool calls and response formats before changing its model. A higher context limit or a lower token price does not, on its own, tell you which answer will be more useful.