Gemini 3.1 Pro Preview
google/gemini-3.1-pro-previewAdvanced intelligence with powerful agentic and vibe-coding capabilities
Cheap mode · 50% off ↓Cheap mode · 50% off
Fast mode prioritizes response speed. Cheap mode uses lower-cost capacity and may be a little slower. Both run Gemini 3.1 Pro Preview.
Per 1M tokens, including your 5% fee. Your selection carries into the playground and API example.
| Per 1 million tokens | Fast mode | Cheap mode | You save |
|---|---|---|---|
| Input | $2.1 | $1.05 | 50.0% |
| Output | $12.6 | $6.3 | 50.0% |
All displayed prices include the 5% Free-plan fee. Standard rates are OpenRouter’s published routing ceilings; the actual standard bill may be lower. Cheapest quote: Google. Savings compare uncached token rates; other provider charges and your usage mix can change the total. Availability is not guaranteed.
Quote checked 11/8/2026, 8:18:04 PM UTC.
Choose how to use Gemini 3.1 Pro Preview
Playground
Try prompts in your browser, create an agent, and see the cost of each reply. Your selected model carries into setup.
Model capabilities below describe the underlying model. Available playground features depend on its provider.
API
Connect your app with a Gizmo API key. Choose fastest or cheapest, stream text responses, and inspect timing, tokens, and charges in request logs.
A current API route is listed for this exact model. Gateway configuration is required for live calls.
Provider price + a transparent platform fee
| Rate | Provider baseline | Free plan · 5% fee | Paid plan · 4% fee |
|---|---|---|---|
| Input / 1M tokens | $2 | $2.1 | $2.08 |
| Output / 1M tokens | $12 | $12.6 | $12.48 |
| API input / 1M tokens | $2 | $2.1 | $2.08 |
| API output / 1M tokens | $12 | $12.6 | $12.48 |
Legacy chat image rates use the catalog baseline. The dedicated image playground shows separate estimates and settles the provider’s metered usage. API rates are current routing ceilings; final API charges use provider-reported cost plus your fee. Cheapest routing compares eligible OpenRouter and Cheaper Inference rates for the same model; savings are not guaranteed. Cached input or other provider charges may differ. Compare all model rates and verified discounts →
How your plan pays for usage
API and playground share one included allowance. Usage including the fee draws from that allowance first, then your prepaid credits. Plans bill monthly; included usage resets weekly: Free $1, Starter $5, Growth $25, Scale $50.
A $1 provider charge becomes $1.05 on Free or $1.04 on a paid plan before included usage is applied. Plan eligibility still applies in the playground.
Free models and limits
Zero-cost models stay $0, including the fee, and do not consume your dollar allowance. Free accounts can make 1,000 free-model API requests per calendar month, resetting in UTC. Admitted requests count even if the provider fails.
Free includes 20 API requests/minute and 6 playground messages/minute. Paid plans raise these limits. See plan limits.
Before a text API request, Gizmo temporarily reserves included usage and, if necessary, prepaid credit for the model’s full context plus your maximum output. Image jobs reserve twice their displayed estimate. Unused funds return after metering. This hold can exceed the final charge; unconfirmed usage remains marked pending.
Overview
Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation of the Gemini 3 series, it combines high-precision reasoning across text, image, video, audio, and code with a 1M-token context window. Reasoning Details must be preserved when using multi-turn tool calling, see our docs here: https://openrouter.ai/docs/use-cases/reasoning-tokens#preserving-reasoning(opens in new tab). The 3.1 update introduces measurable gains in SWE benchmarks and real-world coding environments, along with stronger autonomous task execution in structured domains such as finance and spreadsheet-based workflows.
Designed for advanced development and agentic systems, Gemini 3.1 Pro Preview improves long-horizon stability and tool orchestration while increasing token efficiency. It introduces a new medium thinking level to better balance cost, speed, and performance. The model excels in agentic coding, structured planning, multimodal analysis, and workflow automation, making it well-suited for autonomous agents, financial modeling, spreadsheet automation, and high-context enterprise tasks.
Strengths
- Complex problem-solving
- Strong agentic coding
- Full multimodal input
Best for
Benchmarks
Artificial Analysis indices independent, 0–100
Design Arena head-to-head, human-voted
| Category | Elo | Win rate | Rank |
|---|---|---|---|
| agentichtmlslides (agent) | 1226 | 55.8% | #4 |
| agenticslides(html) (agent) | 1219 | 54.4% | #4 |
| godotgamedev (agent) | 1236 | 60% | #5 |
| SVG | 1314 | 68% | #6 |
| agenticslides (agent) | 1112 | 33.8% | #7 |
| agenticslides(python-pptx) (agent) | 1107 | 33.9% | #7 |
| pptxslides (agent) | 1110 | 34.1% | #7 |
| ASCII art | 1291 | 63.5% | #8 |
Capabilities
Reasoning is always on with effort levels high · medium · low (default medium).
Sampling controls: temperature, top_p, max_tokens. Defaults: top_k null, top_p null, temperature null, presence_penalty null, frequency_penalty null, repetition_penalty null.
Pricing on Gizmo
These are provider baseline rates before Gizmo’s 5% Free-plan or 4% paid-plan fee. Your included usage covers charges first; overage uses prepaid credits. See the fee-inclusive comparison above.
Provider baseline rates
- Input
- $2 / 1M
- Cached input
- $0.2 / 1M
- Cache write
- $0.375 / 1M
- Output
- $12 / 1M
- Web search
- $0.014 / call
Examples before the platform fee
- Typical chat turn
- $0.01 2k in · 500 out
- $1 of input
- ≈ 500k tokens
- $1 of output
- ≈ 83k tokens
- Full context, once
- $2.10
Providers and pricing
7 ways to run Gemini 3.1 Pro Preview on Gizmo, cheapest first. Requests follow your routing choice and fall back down this list if a provider fails.
| Provider | Route | Input / 1M | Output / 1M | Context | Uptime 24h |
|---|---|---|---|---|---|
| Cheaper Inference · flexLowest priceFlex tier: slower, discounted | Cheaper Inference | $0.85 | $5.10 | 200k | — |
| Google · globalFlex tier: slower, discounted | OpenRouter | $1.00 | $6.00 | 1.05M | 89.7% |
| Google AI Studio · flexFlex tier: slower, discounted | OpenRouter | $1.00 | $6.00 | 1.05M | 100% |
| Cheaper Inference | Cheaper Inference | $1.70 | $10.20 | 1M | — |
| Direct | $2.00 | $12.00 | 1.05M | 24.9% | |
| Google · global | OpenRouter | $2.00 | $12.00 | 1.05M | 100% |
| Google AI Studio | OpenRouter | $2.00 | $12.00 | 1.05M | 99.9% |
Rates are each provider’s, per million tokens, before Gizmo’s 5% (Free) or 4% (paid) fee. “Cheapest” routing starts at the top of this list; “Fastest” starts with the model’s maker.
More from Google
Gemini Omni 1.2 FlashGoogle · 131k ctx$1.50 · $9Gemini Omni 1.1 FlashGoogle · 131k ctx$1.50 · $9Gemini 4 ArgonGoogle · 1.05M ctx$2 · $10Gemini 3.8 FlashGoogle · 1.05M ctx$0.75 · $3.75Gemini 3.1 Flash-LiteGoogle · 1.05M ctx$0.25 · $1.50Gemini 2.5 ProGoogle · 1.05M ctx$1.25 · $10Gemini 3.7 FlashGoogle · 1.05M ctx$0.75 · $3.75Gemini 3.6 FlashGoogle · 1.05M ctx$0.75 · $3.75Similar price, other creators
Run Gemini 3.1 Pro Preview in under a minute
Create your account
Sign up with just an email. Start on the free tier with no card, or pick a paid plan for a bigger weekly allowance and $25 in bonus credits.
Your agent is ready
Gemini 3.1 Pro Preview is preselected as the brain of your first agent. Give it a name and a system prompt, or keep the defaults.
Chat, research, create
Live web research and image generation are built in. Every reply shows what it cost, and you can switch models anytime.