Models, measured side by side
Gemini 3.1 Pro (Preview) vs GPT-6 Astra
Compare Gemini 3.1 Pro (Preview), GPT-6 Astra by token pricing, context length, benchmark results, speed and tool support.
Monthly workload
Monthly cost breakdown
InputOutput
Gemini 3.1 Pro (Preview)
$100 / mo
GPT-6 Astra
$450 / mo
Performance comparison
Gemini 3.1 Pro (Preview)
29.7
GPT-6 Astra
52.7
Overview
| Overview | Gemini 3.1 Pro (Preview) | GPT-6 Astra |
|---|---|---|
| Provider | OpenAI | |
| Released | Not listed | 2026-08 |
| Status | Active | Active |
| Input formats | audiofileimagetextvideo | fileimagetext |
| Output formats | text | text |
Provider
Released
- Gemini 3.1 Pro (Preview)
- Not listed
- GPT-6 Astra
- 2026-08
Status
- Gemini 3.1 Pro (Preview)
- Active
- GPT-6 Astra
- Active
Input formats
- Gemini 3.1 Pro (Preview)
- audiofileimagetextvideo
- GPT-6 Astra
- fileimagetext
Output formats
- Gemini 3.1 Pro (Preview)
- text
- GPT-6 Astra
- text
Pricing & capacity
| Pricing & capacity | Gemini 3.1 Pro (Preview) | GPT-6 Astra |
|---|---|---|
| Input / 1M tokens | $2.00 | $10 |
| Output / 1M tokens | $12 | $50 |
| Cached input / 1M | $0.20 | $1.00 |
| Monthly cost | $100 | $450 |
| Context window | 1M | 1.1M |
| Maximum output | 66K | 128K |
Input / 1M tokens
- Gemini 3.1 Pro (Preview)
- $2.00
- GPT-6 Astra
- $10
Output / 1M tokens
- Gemini 3.1 Pro (Preview)
- $12
- GPT-6 Astra
- $50
Cached input / 1M
- Gemini 3.1 Pro (Preview)
- $0.20
- GPT-6 Astra
- $1.00
Monthly cost
- Gemini 3.1 Pro (Preview)
- $100
- GPT-6 Astra
- $450
Context window
- Gemini 3.1 Pro (Preview)
- 1M
- GPT-6 Astra
- 1.1M
Maximum output
- Gemini 3.1 Pro (Preview)
- 66K
- GPT-6 Astra
- 128K
Benchmarks & performance
| Benchmarks & performance | Gemini 3.1 Pro (Preview) | GPT-6 Astra |
|---|---|---|
| Arena Elo | 1,272 | 1,288 |
| MMLU-Pro | 85.6% | 88.3% |
| Intelligence Index | 29.7 | 52.7 |
| GPQA | 94.1% | 96.1% |
| Humanity’s Last Exam | 47% | 54.7% |
| SciCode | 58.7% | 56.5% |
| Output speed | 120 tokens/s | 60 tokens/s |
| Time to first token | 25.66 s | 287.74 s |
| DesignArena rating | 1,235 | 1,384 |
| DesignArena win rate | 54.4% | 64.8% |
Arena Elo
- Gemini 3.1 Pro (Preview)
- 1,272
- GPT-6 Astra
- 1,288
MMLU-Pro
- Gemini 3.1 Pro (Preview)
- 85.6%
- GPT-6 Astra
- 88.3%
Intelligence Index
- Gemini 3.1 Pro (Preview)
- 29.7
- GPT-6 Astra
- 52.7
GPQA
- Gemini 3.1 Pro (Preview)
- 94.1%
- GPT-6 Astra
- 96.1%
Humanity’s Last Exam
- Gemini 3.1 Pro (Preview)
- 47%
- GPT-6 Astra
- 54.7%
SciCode
- Gemini 3.1 Pro (Preview)
- 58.7%
- GPT-6 Astra
- 56.5%
Output speed
- Gemini 3.1 Pro (Preview)
- 120 tokens/s
- GPT-6 Astra
- 60 tokens/s
Time to first token
- Gemini 3.1 Pro (Preview)
- 25.66 s
- GPT-6 Astra
- 287.74 s
DesignArena rating
- Gemini 3.1 Pro (Preview)
- 1,235
- GPT-6 Astra
- 1,384
DesignArena win rate
- Gemini 3.1 Pro (Preview)
- 54.4%
- GPT-6 Astra
- 64.8%
Tools & features
| Tools & features | Gemini 3.1 Pro (Preview) | GPT-6 Astra |
|---|---|---|
| Function calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Built-in web search | Not listed | Not listed |
| Log probabilities | Not listed | Not listed |
| Deterministic seed | Supported | Supported |
| Parallel tool calls | Not listed | Not listed |
| Prompt caching | Supported | Supported |
Function calling
- Gemini 3.1 Pro (Preview)
- Supported
- GPT-6 Astra
- Supported
Structured outputs
- Gemini 3.1 Pro (Preview)
- Supported
- GPT-6 Astra
- Supported
JSON mode
- Gemini 3.1 Pro (Preview)
- Supported
- GPT-6 Astra
- Supported
Reasoning
- Gemini 3.1 Pro (Preview)
- Supported
- GPT-6 Astra
- Supported
Built-in web search
- Gemini 3.1 Pro (Preview)
- Not listed
- GPT-6 Astra
- Not listed
Log probabilities
- Gemini 3.1 Pro (Preview)
- Not listed
- GPT-6 Astra
- Not listed
Deterministic seed
- Gemini 3.1 Pro (Preview)
- Supported
- GPT-6 Astra
- Supported
Parallel tool calls
- Gemini 3.1 Pro (Preview)
- Not listed
- GPT-6 Astra
- Not listed
Prompt caching
- Gemini 3.1 Pro (Preview)
- Supported
- GPT-6 Astra
- Supported
API & availability
| API & availability | Gemini 3.1 Pro (Preview) | GPT-6 Astra |
|---|---|---|
| API identifier | gemini-3.1-pro-preview | gpt-6-astra |
| API providers | Google, Google AI Studio, Google, Google AI Studio, Google, Google AI Studio | OpenAI, Azure, OpenAI, Amazon Bedrock, Azure, OpenAI |
| Knowledge cutoff | Not listed | Not listed |
| Prices checked | Oct 8, 2026 | Oct 8, 2026 |
API identifier
- Gemini 3.1 Pro (Preview)
gemini-3.1-pro-preview- GPT-6 Astra
gpt-6-astra
API providers
- Gemini 3.1 Pro (Preview)
- Google, Google AI Studio, Google, Google AI Studio, Google, Google AI Studio
- GPT-6 Astra
- OpenAI, Azure, OpenAI, Amazon Bedrock, Azure, OpenAI
Knowledge cutoff
- Gemini 3.1 Pro (Preview)
- Not listed
- GPT-6 Astra
- Not listed
Prices checked
- Gemini 3.1 Pro (Preview)
- Oct 8, 2026
- GPT-6 Astra
- Oct 8, 2026
About the models
Gemini 3.1 Pro (Preview)
Google's 3rd generation Pro model, built for multimodal understanding, agentic capabilities, and vibe-coding.
Full pricing & detailsGPT-6 Astra
OpenAI's flagship GPT-6 model for the hardest reasoning, coding and agentic work. Long-context requests (above 272K input tokens) bill at $20 input / $75 output per 1M.
Full pricing & detailsComparison FAQ
Gemini 3.1 Pro (Preview): $2.00 input and $12 output per million tokens. GPT-6 Astra: $10 input and $50 output per million tokens. The cheaper choice depends on your input-to-output ratio; a model can have a lower input rate but a higher output rate.