Neither wins outright: Google: Gemini 2.5 Flash Lite Preview 09-2025 is the pick when you need audio input, Z.ai: GLM 5.3 Flash (batch) when cost matters at scale.
| Spec | Google: Gemini 2.5 Flash Lite Preview 09-2025 | Z.ai: GLM 5.3 Flash (batch) |
|---|---|---|
| Provider | Z Ai | |
| Input price (per 1M tokens) | $0.10 | $0.05 |
| Output price (per 1M tokens) | $0.40 | $0.18 |
| Blended price (3:1 input/output) | $0.18 | $0.08 |
| Cheaper than … of all models we track | 71% | 83% |
| Context window | 1.0M tokens (~1,573 pages) | 1.0M tokens (~1,573 pages) |
| Larger context than … of all models | 81% | 81% |
| Max output per response | 66K tokens (~49,200 words) | 131K tokens (~98,300 words) |
| Input types | text, image, file, audio, video | text, image, video |
| Output types | text | text |
| Free variant | No | No |
| Listed since | 2025-09-25 | 2026-08-26 |
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: Gemini 2.5 Flash Lite Preview 09-2025 | Z.ai: GLM 5.3 Flash (batch) | Difference |
|---|---|---|---|
| Customer-support chatbot 50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens) | $15.50 | $7.35 | Z.ai: GLM 5.3 Flash (batch) saves $8.15 |
| RAG search over documents 20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens) | $16.00 | $7.80 | Z.ai: GLM 5.3 Flash (batch) saves $8.20 |
| 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) | $16.80 | $8.16 | Z.ai: GLM 5.3 Flash (batch) saves $8.64 |
| Batch summarisation 10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens) | $10.40 | $5.08 | Z.ai: GLM 5.3 Flash (batch) saves $5.32 |
| Long-document analysis 500 documents — each a 150-page contract or codebase read in one pass (100,000 in / 2,000 out tokens) | $5.40 | $2.68 | Z.ai: GLM 5.3 Flash (batch) saves $2.72 |
| Capability | Google: Gemini 2.5 Flash Lite Preview 09-2025 | Z.ai: GLM 5.3 Flash (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 | ✓ Yes | — | take speech or audio directly |
| File / PDF input | ✓ Yes | — | 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 |
|---|---|---|---|
| 2026-10-16 | Z.ai: GLM 5.3 Flash (batch) | $0.05 | $0.18 |
| 2026-09-23 | Z.ai: GLM 5.3 Flash (batch) | $0.06 | $0.20 |
| 2026-09-09 | Z.ai: GLM 5.3 Flash (batch) | $0.07 | $0.25 |
Neither wins outright: Google: Gemini 2.5 Flash Lite Preview 09-2025 is the pick when you need audio input, Z.ai: GLM 5.3 Flash (batch) when cost matters at scale. In short: Google: Gemini 2.5 Flash Lite Preview 09-2025 when you need audio input, you need file / PDF input; Z.ai: GLM 5.3 Flash (batch) when cost matters at scale, you need log-probabilities, you generate long outputs in one go, you want the newer model.
Z.ai: GLM 5.3 Flash (batch) is cheaper: $0.08 vs $0.18 per 1M tokens at a typical 3:1 input/output mix, 53% less. For 50,000 support conversations a month that is $7.35 against $15.50.
Google: Gemini 2.5 Flash Lite Preview 09-2025 costs $0.10 per 1M input tokens and $0.40 per 1M output tokens; Z.ai: GLM 5.3 Flash (batch) costs $0.05 input and $0.18 output. Output tokens are billed separately, so long answers shift the gap.
Both take 1.0M tokens per request — roughly 1,573 pages of text.
Tool calling — Google: Gemini 2.5 Flash Lite Preview 09-2025: yes, Z.ai: GLM 5.3 Flash (batch): yes. JSON-schema structured output — Google: Gemini 2.5 Flash Lite Preview 09-2025: yes, Z.ai: GLM 5.3 Flash (batch): yes.
Yes, both accept image input.
No free variant is listed for either; both are pay-per-token.
Google: Gemini 2.5 Flash Lite Preview 09-2025 can write up to 66K tokens (about 49,200 words) per response; Z.ai: GLM 5.3 Flash (batch) up to 131K (about 98,300 words).
Google: Gemini 2.5 Flash Lite Preview 09-2025 was listed on 2025-09-25; Z.ai: GLM 5.3 Flash (batch) on 2026-08-26.
Google: Gemini 2.5 Flash Lite Preview 09-2025: price unchanged since we started tracking it on 2026-03-10. Z.ai: GLM 5.3 Flash (batch): input price cut 17% ($0.06 → $0.05/1M), output price cut 10% ($0.20 → $0.18/1M) on 2026-10-16 (3 price changes since 2026-08-29).
Gemini 2.5 Flash-Lite is a lightweight reasoning model in the Gemini 2.5 family, optimized for ultra-low latency and cost efficiency. It offers improved throughput, faster token generation, and better performance across common benchmarks compared to earlier Flash models. By default, "thinking" (i.e. multi-pass reasoning) is disabled to prioritize speed, but developers can enable it via the [Reasoning API parameter](https://openrouter.ai/docs/use-cases/reasoning-tokens) to selectively trade off cost for intelligence.
Full Google: Gemini 2.5 Flash Lite Preview 09-2025 specs →GLM-5.3-Flash is a native multimodal model from Z.ai. It is suited for efficient coding and long-horizon agent tasks. Its hybrid sparse and linear attention architecture maintains accurate long-context behavior while...
Full Z.ai: GLM 5.3 Flash (batch) specs →