Neither wins outright: Google: Gemma 4 31B is the pick when you need image input, XingChen: Xing4.0 29B A4B (free) when cost matters at scale.
| Spec | Google: Gemma 4 31B | XingChen: Xing4.0 29B A4B (free) |
|---|---|---|
| Provider | Xingchen Agi | |
| Input price (per 1M tokens) | $0.20 | $0 |
| Output price (per 1M tokens) | $0.40 | $0 |
| Blended price (3:1 input/output) | $0.25 | $0 |
| Cheaper than … of all models we track | 66% | 90% |
| 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) | 236K tokens (~176,900 words) |
| Input types | image, text, video | text |
| Output types | text | text |
| Free variant | Yes | Yes |
| Listed since | 2026-04-02 | 2026-10-16 |
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 | XingChen: Xing4.0 29B A4B (free) | Difference |
|---|---|---|---|
| Customer-support chatbot 50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens) | $23.00 | $0 | XingChen: Xing4.0 29B A4B (free) saves $23.00 |
| RAG search over documents 20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens) | $28.00 | $0 | XingChen: Xing4.0 29B A4B (free) saves $28.00 |
| 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 | $0 | XingChen: Xing4.0 29B A4B (free) saves $28.80 |
| Batch summarisation 10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens) | $18.40 | $0 | XingChen: Xing4.0 29B A4B (free) saves $18.40 |
| 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 | $0 | XingChen: Xing4.0 29B A4B (free) saves $10.40 |
| Capability | Google: Gemma 4 31B | XingChen: Xing4.0 29B A4B (free) | 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 | — | 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.
| Date | Model | Input / 1M | Output / 1M |
|---|---|---|---|
| 2026-10-15 | Google: Gemma 4 31B | $0.20 | $0.40 |
| 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 |
Neither wins outright: Google: Gemma 4 31B is the pick when you need image input, XingChen: Xing4.0 29B A4B (free) when cost matters at scale. In short: Google: Gemma 4 31B when you need image input, you need log-probabilities; XingChen: Xing4.0 29B A4B (free) when cost matters at scale, you generate long outputs in one go, you want the newer model.
XingChen: Xing4.0 29B A4B (free) is cheaper: $0 vs $0.25 per 1M tokens at a typical 3:1 input/output mix, 100% less. For 50,000 support conversations a month that is $0 against $23.00.
Google: Gemma 4 31B costs $0.20 per 1M input tokens and $0.40 per 1M output tokens; XingChen: Xing4.0 29B A4B (free) costs $0 input and $0 output. Output tokens are billed separately, so long answers shift the gap.
Both take 262K tokens per request — roughly 393 pages of text.
Tool calling — Google: Gemma 4 31B: yes, XingChen: Xing4.0 29B A4B (free): yes. JSON-schema structured output — Google: Gemma 4 31B: yes, XingChen: Xing4.0 29B A4B (free): yes.
Only Google: Gemma 4 31B accepts image input; XingChen: Xing4.0 29B A4B (free) is text-only for input.
Google: Gemma 4 31B has a free variant (google/gemma-4-31b-it:free); XingChen: Xing4.0 29B A4B (free) has a free variant (xingchen-agi/xing4.0-29b-a4b:free). Free variants usually carry tighter rate limits.
Google: Gemma 4 31B can write up to 16K tokens (about 12,300 words) per response; XingChen: Xing4.0 29B A4B (free) up to 236K (about 176,900 words).
Google: Gemma 4 31B was listed on 2026-04-02; XingChen: Xing4.0 29B A4B (free) on 2026-10-16.
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). XingChen: Xing4.0 29B A4B (free): price unchanged since we started tracking it on 2026-10-17.
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 →Xing4.0-29B-A4B is an open-weight mixture-of-experts language model from China Telecom's AI team (TeleAI) and the successor to the TeleChat series. It has 29B total parameters with 4B active per token...
Full XingChen: Xing4.0 29B A4B (free) specs →