Which is cheaper, Gemini 3.7 Flash and GLM-5.3?

GLM-5.3 has the lowest input price. Per 1M input tokens: Gemini 3.7 Flash from $0.75 and GLM-5.3 from $0.56.

Which is better for coding, Gemini 3.7 Flash and GLM-5.3?

Gemini 3.7 Flash scores highest on the Artificial Analysis Coding Index: Gemini 3.7 Flash 76.1 and GLM-5.3 74.8.

Which is smarter, Gemini 3.7 Flash and GLM-5.3?

GLM-5.3 scores highest on the Artificial Analysis Intelligence Index: Gemini 3.7 Flash 39.1 and GLM-5.3 44.8.

Can I switch between Gemini 3.7 Flash and GLM-5.3 without changing my code?

Yes. All of them are served through FastRouter's OpenAI-compatible API, so switching is a change of the model parameter (google/gemini-3.7-flash, z-ai/glm-5.3).

Gemini 3.7 Flash vs GLM-5.3

Side-by-side pricing per provider, context window, benchmark scores and speed, all on one OpenAI-compatible API.

Gemini 3.7 Flash Googlegoogle/gemini-3.7-flash

GLM-5.3 Z.aiz-ai/glm-5.3

Creator

Google

Z.ai

Released

Aug 13, 2026

Aug 18, 2026

Context window

1.05M

Max output

66K

131K

Input / 1MLowest provider price

$0.75

$0.56$0.56–$1.40 across 5

Output / 1MLowest provider price

$3.75

$2.50$2.50–$4.40 across 5

Providers

IntelligenceArtificial Analysis index

39.1

44.8

CodingArtificial Analysis index

76.1

74.8

Accepts

Text, Image, Audio, Video, Files

Text

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Yes

Gemini 3.7 Flash vs GLM-5.3: summary

Gemini 3.7 Flash and GLM-5.3 are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

Gemini 3.7 Flash, from Google, has a 1,048,576-token context window, costs from $0.75/1M input and $3.75/1M output tokens across 2 providers and scores 39.1 on the Artificial Analysis Intelligence Index.

GLM-5.3, from Z.ai, has a 1,048,576-token context window, costs from $0.56/1M input and $2.50/1M output tokens across 5 providers and scores 44.8 on the Artificial Analysis Intelligence Index.

GLM-5.3 is the cheapest on input, 1.3× cheaper than the next model, GLM-5.3 scores highest for intelligence and Gemini 3.7 Flash leads on coding.

Switch with one line

client = OpenAI(base_url="https://api.fastrouter.ai/api/v1", api_key="<FASTROUTER_API_KEY>") client.chat.completions.create(model="google/gemini-3.7-flash", messages=[...]) # or client.chat.completions.create(model="z-ai/glm-5.3", messages=[...])

Full API docs

Frequently asked questions

More comparisons

Benchmark scores sourced from ArtificialAnalysis