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Google: Gemini 2.5 Flash Lite Preview 09-2025 vs Z.ai: GLM 5.3 (batch)

Neither wins outright: Google: Gemini 2.5 Flash Lite Preview 09-2025 is the pick when cost matters at scale, Z.ai: GLM 5.3 (batch) when you generate long outputs in one go.

Key numbers

SpecGoogle: Gemini 2.5 Flash Lite Preview 09-2025Z.ai: GLM 5.3 (batch)
ProviderGoogleZ Ai
Input price (per 1M tokens)$0.10$0.45
Output price (per 1M tokens)$0.40$2.00
Blended price (3:1 input/output)$0.18$0.84
Cheaper than … of all models we track72%44%
Context window1.0M tokens (~1,573 pages)1.0M tokens (~1,573 pages)
Larger context than … of all models80%80%
Max output per response66K tokens (~49,200 words)131K tokens (~98,300 words)
Input typestext, image, file, audio, videotext
Output typestexttext
Free variantNoNo
Listed since2025-09-252026-08-18
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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: Gemini 2.5 Flash Lite Preview 09-2025Z.ai: GLM 5.3 (batch)Difference
Customer-support chatbot
50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens)
$15.50$73.75Google: Gemini 2.5 Flash Lite Preview 09-2025 saves $58.25
RAG search over documents
20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens)
$16.00$74.00Google: Gemini 2.5 Flash Lite Preview 09-2025 saves $58.00
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)
$16.80$78.00Google: Gemini 2.5 Flash Lite Preview 09-2025 saves $61.20
Batch summarisation
10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens)
$10.40$48.00Google: Gemini 2.5 Flash Lite Preview 09-2025 saves $37.60
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$24.50Google: Gemini 2.5 Flash Lite Preview 09-2025 saves $19.10

Capabilities side by side

CapabilityGoogle: Gemini 2.5 Flash Lite Preview 09-2025Z.ai: GLM 5.3 (batch)What it lets you do
Tool / function calling✓ Yes✓ Yescall your APIs and run agent loops
Structured output (JSON schema)✓ Yes✓ Yesreturn JSON that validates against your schema
Reasoning / thinking mode✓ Yes✓ Yesspend extra tokens thinking before answering hard problems
Image input✓ 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✓ Yesrepeat a generation for tests and evals
Log-probabilities——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

DateModelInput / 1MOutput / 1M
2026-09-24Z.ai: GLM 5.3 (batch)$0.45$2.00
2026-09-23Z.ai: GLM 5.3 (batch)$0.72$2.40

Which should you choose?

Choose Google: Gemini 2.5 Flash Lite Preview 09-2025 if…

  • cost matters at scale — it is 79% cheaper on a typical 3:1 input/output mix ($15.50 vs $73.75 a month for 50,000 support chats)
  • you need image input — to read screenshots, charts and scanned pages; Z.ai: GLM 5.3 (batch) does not advertise it
  • you need audio input — to take speech or audio directly; Z.ai: GLM 5.3 (batch) does not advertise it
  • you need file / PDF input — to accept documents without your own parsing step; Z.ai: GLM 5.3 (batch) does not advertise it

Choose Z.ai: GLM 5.3 (batch) if…

  • you generate long outputs in one go — up to 131K tokens (about 98,300 words) per response
  • you want the newer model — released 2026-08-18, 11 months after the other

Frequently asked questions

Is Google: Gemini 2.5 Flash Lite Preview 09-2025 better than Z.ai: GLM 5.3 (batch)?

Neither wins outright: Google: Gemini 2.5 Flash Lite Preview 09-2025 is the pick when cost matters at scale, Z.ai: GLM 5.3 (batch) when you generate long outputs in one go. In short: Google: Gemini 2.5 Flash Lite Preview 09-2025 when cost matters at scale, you need image input, you need audio input, you need file / PDF input; Z.ai: GLM 5.3 (batch) when you generate long outputs in one go, you want the newer model.

Which is cheaper, Google: Gemini 2.5 Flash Lite Preview 09-2025 or Z.ai: GLM 5.3 (batch)?

Google: Gemini 2.5 Flash Lite Preview 09-2025 is cheaper: $0.18 vs $0.84 per 1M tokens at a typical 3:1 input/output mix, 79% less. For 50,000 support conversations a month that is $15.50 against $73.75.

How much do Google: Gemini 2.5 Flash Lite Preview 09-2025 and Z.ai: GLM 5.3 (batch) cost per million tokens?

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 (batch) costs $0.45 input and $2.00 output. Output tokens are billed separately, so long answers shift the gap.

Which has the bigger context window, Google: Gemini 2.5 Flash Lite Preview 09-2025 or Z.ai: GLM 5.3 (batch)?

Both take 1.0M tokens per request — roughly 1,573 pages of text.

Do Google: Gemini 2.5 Flash Lite Preview 09-2025 and Z.ai: GLM 5.3 (batch) support function calling and JSON output?

Tool calling — Google: Gemini 2.5 Flash Lite Preview 09-2025: yes, Z.ai: GLM 5.3 (batch): yes. JSON-schema structured output — Google: Gemini 2.5 Flash Lite Preview 09-2025: yes, Z.ai: GLM 5.3 (batch): yes.

Can Google: Gemini 2.5 Flash Lite Preview 09-2025 or Z.ai: GLM 5.3 (batch) read images?

Only Google: Gemini 2.5 Flash Lite Preview 09-2025 accepts image input; Z.ai: GLM 5.3 (batch) is text-only for input.

Is Google: Gemini 2.5 Flash Lite Preview 09-2025 or Z.ai: GLM 5.3 (batch) free to use?

No free variant is listed for either; both are pay-per-token.

What is the maximum output length of Google: Gemini 2.5 Flash Lite Preview 09-2025 and Z.ai: GLM 5.3 (batch)?

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 (batch) up to 131K (about 98,300 words).

When were Google: Gemini 2.5 Flash Lite Preview 09-2025 and Z.ai: GLM 5.3 (batch) released?

Google: Gemini 2.5 Flash Lite Preview 09-2025 was listed on 2025-09-25; Z.ai: GLM 5.3 (batch) on 2026-08-18.

Has the price of Google: Gemini 2.5 Flash Lite Preview 09-2025 or Z.ai: GLM 5.3 (batch) changed?

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 (batch): input price cut 37% ($0.72 → $0.45/1M), output price cut 17% ($2.40 → $2.00/1M) on 2026-09-24 (2 price changes since 2026-09-09).

About the two models

Google

Google: Gemini 2.5 Flash Lite Preview 09-2025

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 →

Compare Google: Gemini 2.5 Flash Lite Preview 09-2025 with other models

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Compare Z.ai: GLM 5.3 (batch) with other models

vs AI21: Jamba Large 1.7vs AionLabs: Aion 3.5vs AionLabs: Aion 3.5 Minivs AionLabs: Aion-1.0
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