Gemini 3.1 Pro Preview API1M context

Pricing & specs mirror our live pricing as of July 2026 (pay-as-you-go).

What is Gemini 3.1 Pro Preview?

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...

Gemini 3.1 Pro Preview on the release timeline

Gemini 3.1 Pro Preview pricing

Pay-as-you-go on DataLLM Lab — these are our live list prices (identical to the pricing page):

On output price, Gemini 3.1 Pro Preview is cheaper than 13% of the 309 models in the catalog. It is served by 2 providers; the best combined rate at our last snapshot was ≈ $2.00 / $12.00 per 1M via Google.

What Gemini 3.1 Pro Preview costs per month

Cost = input price × input volume + output price × output volume. The same five workloads run on every model page, so any two compare directly.

Gemini 3.1 Pro Preview vs alternatives

When not to use Gemini 3.1 Pro Preview

• It is premium-priced (output cheaper than only 13% of the catalog) — for routine work a cheaper model likely does the job.

Specs

How to call Gemini 3.1 Pro Preview

Copyfrom openai import OpenAI
client = OpenAI(base_url="https://api.datallmlab.com/v1", api_key="YOUR_DATALLM_LAB_KEY")
resp = client.chat.completions.create(
    model="google/gemini-3.1-pro-preview",
    messages=[{"role": "user", "content": "Hello"}],
    # supports tools=[...] and tool_choice
)
print(resp.choices[0].message.content)

Copycurl https://api.datallmlab.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"google/gemini-3.1-pro-preview","messages":[{"role":"user","content":"Hello"}]}'

Copyimport OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://api.datallmlab.com/v1", apiKey: process.env.DATALLM_KEY });
const r = await client.chat.completions.create({
  model: "google/gemini-3.1-pro-preview",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(r.choices[0].message.content);

The same key routes Gemini 3.1 Pro Preview and 300+ other models — switch models by changing one string. How OpenAI-compatible APIs work.

Prompting tips for Gemini 3.1 Pro Preview

• State the goal, not every step. Gemini 3.1 Pro Preview reasons internally — give it the objective, constraints and success criteria and let it plan the approach; over-scripting each step tends to lower quality. Turn effort up for hard problems.
• Huge 1M context — but anchor the ask. You can paste whole documents or codebases; models attend most to the start and end, so put the key instruction at the top and restate it after long inputs.
• It reads images. Send image parts alongside your text and ask for specific outputs (named JSON fields, a table, "what changed") rather than "describe this".
• Give it real tools. Pass a tools=[...] schema instead of asking it to "pretend" — let Gemini 3.1 Pro Preview emit tool calls, execute them, and feed results back for the next turn.
• Constrain JSON with a schema. Use response_format / structured outputs rather than "reply in JSON" to get valid, parseable objects every time.

Tips are derived from Gemini 3.1 Pro Preview's actual capabilities — context window, tool & JSON support, modality and price tier — not generic advice.

Open-source tools for Gemini 3.1 Pro Preview

Popular open-source frameworks and agents to build with Gemini 3.1 Pro Preview over the API — star counts pulled from GitHub (July 2026).

Listed by GitHub stars; inclusion is by ecosystem relevance (agent frameworks, SDKs and gateways), not affiliation. Stars change — see each repo for current numbers.

Migrating to Gemini 3.1 Pro Preview

Coming from OpenAI or another gateway? On an OpenAI-compatible setup the only changes are base_url → https://api.datallmlab.com/v1 and model → google/gemini-3.1-pro-preview. Messages, streaming, tool calls and the rest of your code stay the same. Routing & failover guide.

Rate limits & reliability

Rate limits here are the DataLLM Lab gateway's, not the upstream vendor's. On 429 (rate limited) or 503 (provider busy), retry with exponential backoff; because Gemini 3.1 Pro Preview is served by 2 providers, requests can fail over to a healthy one automatically. See the error-code guide and failover setup.

Related reading

Frequently asked questions