Choose Google: Gemma 4 31B if…
- you need log-probabilities — to read token confidence for classification and scoring; Mistral: Mistral Small 4 (batch) does not advertise it
- you want to prototype at zero cost — a free variant is listed
Google: Gemma 4 31B vs Mistral: Mistral Small 4 (batch)
Neither wins outright: Google: Gemma 4 31B is the pick when you need log-probabilities, Mistral: Mistral Small 4 (batch) when cost matters at scale.
Key numbers
| Spec | Google: Gemma 4 31B | Mistral: Mistral Small 4 (batch) |
|---|---|---|
| Provider | Mistral AI | |
| Input price (per 1M tokens) | $0.20 | $0.07 |
| Output price (per 1M tokens) | $0.40 | $0.30 |
| Blended price (3:1 input/output) | $0.25 | $0.13 |
| Cheaper than … of all models we track | 66% | 76% |
| Context window | 262K tokens (~393 pages) | 262K tokens (~393 pages) |
| Larger context than … of all models | 48% | 48% |
| Max output per response | 16K tokens (~12,300 words) | 210K tokens (~157,300 words) |
| Input types | image, text, video | text, image |
| Output types | text | text |
| Free variant | Yes | No |
| Listed since | 2026-04-02 | 2026-03-16 |
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What it costs for real workloads
Monthly cost at list price for five common workloads. Token counts per unit are stated so you can scale them to your own traffic. A workload that does not fit a model's context window is marked rather than priced.
| Workload (per month) | Google: Gemma 4 31B | Mistral: Mistral Small 4 (batch) | Difference |
|---|---|---|---|
| Customer-support chatbot 50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens) | $23.00 | $11.63 | Mistral: Mistral Small 4 (batch) saves $11.38 |
| RAG search over documents 20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens) | $28.00 | $12.00 | Mistral: Mistral Small 4 (batch) saves $16.00 |
| Coding / tool-using agent 2,000 tasks — each a multi-step task with tool calls and file context (60,000 in / 6,000 out tokens) | $28.80 | $12.60 | Mistral: Mistral Small 4 (batch) saves $16.20 |
| Batch summarisation 10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens) | $18.40 | $7.80 | Mistral: Mistral Small 4 (batch) saves $10.60 |
| Long-document analysis 500 documents — each a 150-page contract or codebase read in one pass (100,000 in / 2,000 out tokens) | $10.40 | $4.05 | Mistral: Mistral Small 4 (batch) saves $6.35 |
Capabilities side by side
| Capability | Google: Gemma 4 31B | Mistral: Mistral Small 4 (batch) | What it lets you do |
|---|---|---|---|
| Tool / function calling | ✓ Yes | ✓ Yes | call your APIs and run agent loops |
| Structured output (JSON schema) | ✓ Yes | ✓ Yes | return JSON that validates against your schema |
| Reasoning / thinking mode | ✓ Yes | ✓ Yes | spend extra tokens thinking before answering hard problems |
| Image input | ✓ Yes | ✓ Yes | read screenshots, charts and scanned pages |
| Audio input | — | — | take speech or audio directly |
| File / PDF input | — | — | accept documents without your own parsing step |
| Image output | — | — | generate images, not just text |
| Built-in web search | — | — | answer from live web results |
| Seed (reproducible sampling) | ✓ Yes | ✓ Yes | repeat a generation for tests and evals |
| Log-probabilities | ✓ Yes | — | read token confidence for classification and scoring |
From each model's published parameters and input/output types. “—” means not advertised, not proven absent.
Price history
- Google: Gemma 4 31B: input price raised 55% ($0.09 → $0.20/1M), output price raised 15% ($0.34 → $0.40/1M) on 2026-10-15 (4 price changes since 2026-08-06).
- Mistral: Mistral Small 4 (batch): input price cut 50% ($0.15 → $0.07/1M), output price cut 50% ($0.60 → $0.30/1M) on 2026-09-10.
| Date | Model | Input / 1M | Output / 1M |
|---|---|---|---|
| 2026-10-15 | Google: Gemma 4 31B | $0.20 | $0.40 |
| 2026-09-10 | Mistral: Mistral Small 4 (batch) | $0.07 | $0.30 |
| 2026-08-27 | Google: Gemma 4 31B | $0.09 | $0.34 |
| 2026-08-21 | Google: Gemma 4 31B | $0.10 | $0.34 |
| 2026-08-19 | Google: Gemma 4 31B | $0.09 | $0.34 |
Which should you choose?
Choose Mistral: Mistral Small 4 (batch) if…
- cost matters at scale — it is 48% cheaper on a typical 3:1 input/output mix ($11.63 vs $23.00 a month for 50,000 support chats)
- you generate long outputs in one go — up to 210K tokens (about 157,300 words) per response
Frequently asked questions
Is Google: Gemma 4 31B better than Mistral: Mistral Small 4 (batch)?
Neither wins outright: Google: Gemma 4 31B is the pick when you need log-probabilities, Mistral: Mistral Small 4 (batch) when cost matters at scale. In short: Google: Gemma 4 31B when you need log-probabilities, you want to prototype at zero cost; Mistral: Mistral Small 4 (batch) when cost matters at scale, you generate long outputs in one go.
Which is cheaper, Google: Gemma 4 31B or Mistral: Mistral Small 4 (batch)?
Mistral: Mistral Small 4 (batch) is cheaper: $0.13 vs $0.25 per 1M tokens at a typical 3:1 input/output mix, 48% less. For 50,000 support conversations a month that is $11.63 against $23.00.
How much do Google: Gemma 4 31B and Mistral: Mistral Small 4 (batch) cost per million tokens?
Google: Gemma 4 31B costs $0.20 per 1M input tokens and $0.40 per 1M output tokens; Mistral: Mistral Small 4 (batch) costs $0.07 input and $0.30 output. Output tokens are billed separately, so long answers shift the gap.
Which has the bigger context window, Google: Gemma 4 31B or Mistral: Mistral Small 4 (batch)?
Both take 262K tokens per request — roughly 393 pages of text.
Do Google: Gemma 4 31B and Mistral: Mistral Small 4 (batch) support function calling and JSON output?
Tool calling — Google: Gemma 4 31B: yes, Mistral: Mistral Small 4 (batch): yes. JSON-schema structured output — Google: Gemma 4 31B: yes, Mistral: Mistral Small 4 (batch): yes.
Can Google: Gemma 4 31B or Mistral: Mistral Small 4 (batch) read images?
Yes, both accept image input.
Is Google: Gemma 4 31B or Mistral: Mistral Small 4 (batch) free to use?
Google: Gemma 4 31B has a free variant (google/gemma-4-31b-it:free). Free variants usually carry tighter rate limits.
What is the maximum output length of Google: Gemma 4 31B and Mistral: Mistral Small 4 (batch)?
Google: Gemma 4 31B can write up to 16K tokens (about 12,300 words) per response; Mistral: Mistral Small 4 (batch) up to 210K (about 157,300 words).
When were Google: Gemma 4 31B and Mistral: Mistral Small 4 (batch) released?
Google: Gemma 4 31B was listed on 2026-04-02; Mistral: Mistral Small 4 (batch) on 2026-03-16.
Has the price of Google: Gemma 4 31B or Mistral: Mistral Small 4 (batch) changed?
Google: Gemma 4 31B: input price raised 55% ($0.09 → $0.20/1M), output price raised 15% ($0.34 → $0.40/1M) on 2026-10-15 (4 price changes since 2026-08-06). Mistral: Mistral Small 4 (batch): input price cut 50% ($0.15 → $0.07/1M), output price cut 50% ($0.60 → $0.30/1M) on 2026-09-10.
About the two models
Google: Gemma 4 31B
Gemma 4 31B Instruct is Google DeepMind's 30.7B dense multimodal model supporting text and image input with text output. Features a 256K token context window, configurable thinking/reasoning mode, native function...
Full Google: Gemma 4 31B specs →Mistral: Mistral Small 4 (batch)
Mistral Small 4 is the next major release in the Mistral Small family, unifying the capabilities of several flagship Mistral models into a single system. It combines strong reasoning from...
Full Mistral: Mistral Small 4 (batch) specs →