Gemini 3.1 Pro Preview
gemini-3.1-pro-previewGemini 3.1 Pro Preview by Google: 1M context, 64K max output, with Vision, Function Calling, Reasoning, Prompt Caching, Response Schema, Audio, Video, File Input, Streaming, Web Search. Via SoleAPI, Input (prompt) costs 3.2 Credits / M tokens, 76% below list price. 7-day uptime 90.1%. Compatible with Anthropic Messages / Gemini generateContent: swap the base URL and you are connected.
Capabilities
Listed exactly as the catalog flags them, including what this model does not support.
Vision
Natively multimodal: captioning, classification, visual Q&A, chart and screenshot understanding. Images are converted to tokens at the input rate.
Function Calling
Connect the model to external tools and APIs: it decides when to call which function and with what arguments, your code runs it. Force or forbid calls with tool_choice.
Reasoning
The model thinks before answering, which markedly improves multi-step planning and reasoning for coding, math and data analysis. Thinking tokens bill at the output rate.
Prompt Caching
Repeated prefixes (system prompts, long documents) hit the cache: reads cost far less than input, writes are priced by retention time.
Response Schema
Constrain output to a JSON Schema you provide for predictable, type-safe results without parsing free text.
Audio
Audio input or speech output.
Video
Video input understanding or video generation.
File Input
Upload PDFs and other documents directly; the model reads the whole document with native vision.
Streaming
Tokens arrive over SSE as they are generated; the first frame is forwarded immediately with no buffering. Claude Code, Codex and similar tools depend on this.
Web Search
Vendor-hosted live web retrieval; the model decides when to search and cites sources.
RealtimeNot supported
Bidirectional low-latency voice / text sessions over WebSocket.
SessionNot supported
Server-side multi-turn context (e.g. previous_response_id in Responses) so you need not resend history.
MediaNot supported
Image / video / music generation endpoints.
Multipart FormNot supported
multipart/form-data file-upload requests.
Binary ResponseNot supported
Endpoints that return raw audio / image bytes.
Reliability & performance
SoleAPI probes this model through the real supply chain on a schedule — measured, not self-reported.
Latency & throughput
Protocols & code samples
Change the base URL to SoleAPI, keep everything else. Native protocols pass straight through; “adapted” ones are translated by the gateway.
Anthropic SDK or any Messages-protocol client: point base_url at https://api.soleapi.com and use a SoleAPI key.
curl https://api.soleapi.com/v1/messages \
-H "x-api-key: $SOLEAPI_KEY" \
-H "anthropic-version: 2023-06-01" \
-H "content-type: application/json" \
-d '{
"model": "gemini-3.1-pro-preview",
"max_tokens": 1024,
"messages": [{"role": "user", "content": "Explain prompt caching in one sentence"}]
}'Full price list
List price → SoleAPI price per channel, every pricing dimension, nothing hidden.
| Item | Unit | Google list price | Official Gemini Group ×1.676% off |
|---|---|---|---|
| Input (prompt) | per 1M tokens | 3.2 Credits | |
| Output (completion) | per 1M tokens | 19.2 Credits | |
| Cache read | per 1M tokens | 0.32 Credits | |
| Web search (general) | per 1K calls | 22.4 Credits |
“Off” is computed at 1 Credit = ¥1 and today’s rate: 1 − channel multiplier × (1 Credit in the list currency). Priority: when request body field service_tier matches ^priority$, billed at Cache read ×1.8、Output (completion) ×1.8、Input (prompt) ×1.8、other items ×1.8; stacks with any channel. Standard(>200K): when input exceeds 200,000 tokens, billed at Cache read ×2、Output (completion) ×1.5、Input (prompt) ×2; stacks with any channel.
FAQ
How much does the Gemini 3.1 Pro Preview API cost?
Via SoleAPI, Input (prompt) costs 3.2 Credits / M tokens, with 1 Credit = ¥1. That is 76% below the Google list price.
What are the context window and output limit of Gemini 3.1 Pro Preview?
Context window 1M tokens, up to 64K tokens per response.
Does Gemini 3.1 Pro Preview support function calling and structured outputs?
Function calling with tool_choice control is supported; structured outputs (JSON Schema) are supported.
How do I use Gemini 3.1 Pro Preview in Claude Code?
Set ANTHROPIC_BASE_URL=https://api.soleapi.com, ANTHROPIC_API_KEY to your SoleAPI key and ANTHROPIC_MODEL=gemini-3.1-pro-preview, then run claude. No config files to edit.
How is the 90.1% uptime measured?
SoleAPI sends probe requests to this model through the real supply chain on a schedule and divides successful probes by total probes over the last 7 days. When one channel fails the gateway fails over to a backup, so the figure reflects what end users actually see.
One API key for Gemini 3.1 Pro Preview and 30+ models
Free credits on sign-up, pay as you go, no monthly fee.