GLM-5.2 vs Gemini 3.6 Flash: the high volume workhorse showdown
By TechCompare · Updated · How we check
Gemini 3.6 Flash is cheaper than GLM-5.2 on every row, by about 46% on input and 15% on output, and it adds multimodal input. Pick GLM-5.2 only when its results on your own workload justify paying more.
Z.ai: GLM 5.2
Cheapest host: SiliconFlow (fp8)
- Input
- $1.40
- Output
- $4.40
- Cached
- $0.26
per 1M tokens
Price checked 2026-11-12
Google: Gemini 3.6 Flash
Google AI Studio's own price
- Input
- $0.75
- Output
- $3.75
- Cached
- $0.075
per 1M tokens
Price checked 2026-11-12
Cost Comparison
Based on 100,000 input tokens (50% cached), 5,000 output tokens, and 100 requests.Prices come live from OpenRouter at each maker's own price where it's listed. Temporary deals are left out.
GLM-5.2 (Zhipu / Z.ai) and Gemini 3.6 Flash both sit in the workhorse tier of 2026 lineups, each offering a real 1M context window for document-heavy work. On raw price per token, Gemini 3.6 Flash is cheaper on both axes, by about 46% on input and 15% on output. GLM-5.2's case rests on how its results hold up on your own text workloads, not on price.
Two workhorse-tier models targeting the same high-volume document role.
Side-by-side specs
| Spec | GLM-5.2 | Gemini 3.6 Flash |
|---|---|---|
| Input Cost (per M) | $1.40 | $0.75 (better on this spec) |
| Output Cost (per M) | $4.40 | $3.75 (better on this spec) |
| Cached Input (per M)Cached input is text the provider has already processed. It costs less than fresh input. | $0.26 | $0.075 (better on this spec) |
| Batch input / output (per M) | None | $0.375 / $1.875 |
| Native Audio/Video Input | No | Yes (better on this spec) |
| Context Window | 1M | 1.05M |
How they differ
GLM-5.2 is priced at $1.40 per million input tokens and $4.40 per million output tokens on Z.ai's official list, with an 81% prompt caching discount ($0.26 per million). Gemini 3.6 Flash is priced at $0.75 per million input tokens and $3.75 per million output tokens, with a 90% caching discount ($0.075 per million) and a 50% batch API discount.
Gemini Flash's input price is about 46% below GLM-5.2's and its output price about 15% below. The cache discount gap (90% vs 81%) widens the difference further for highly repetitive prompts, so GLM-5.2 has to win on quality or workload fit rather than on price. Gemini Flash also accepts full image, audio, and video input.
Verdict
Flash is the default, and GLM-5.2 is the pick when your own evals show results good enough to pay for. Gemini wins every price row: input ($0.75/M vs $1.40, about 46% lower), output ($3.75/M vs $4.40, about 15% lower), and cached input, where it lands at $0.075/M against GLM's $0.26/M. Only Gemini has batch prices here, and only Gemini has native image/audio/video input.
Which should you pick?
Choose GLM-5.2
Text-only or text-and-file pipelines (RAG, classification, document summarization) where your own evals show GLM-5.2 giving better results, so the extra cost is paid back in fewer retries.
Choose Gemini 3.6 Flash
Most price-sensitive workloads: the lower price on every row and multimodal image, audio, or video input. Gemini also brings the deeper 90% cache discount and a batch tier.