Which is cheaper, Grok 4.6 and GLM-5.3-Flash?

GLM-5.3-Flash has the lowest input price. Per 1M input tokens: Grok 4.6 from $2.00 and GLM-5.3-Flash from $0.07.

Which has the larger context window, Grok 4.6 and GLM-5.3-Flash?

GLM-5.3-Flash has the largest context window: Grok 4.6 500,000 tokens and GLM-5.3-Flash 1,310,720 tokens.

Which is better for coding, Grok 4.6 and GLM-5.3-Flash?

Grok 4.6 scores highest on the Artificial Analysis Coding Index: Grok 4.6 76.8 and GLM-5.3-Flash 71.5.

Which is smarter, Grok 4.6 and GLM-5.3-Flash?

Grok 4.6 scores highest on the Artificial Analysis Intelligence Index: Grok 4.6 44.3 and GLM-5.3-Flash 41.8.

Can I switch between Grok 4.6 and GLM-5.3-Flash 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 (x-ai/grok-4.6, z-ai/glm-5.3-flash).

Grok 4.6 vs GLM-5.3-Flash

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

Grok 4.6 xAIx-ai/grok-4.6

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

Creator

xAI

Z.ai

Released

Aug 12, 2026

Aug 26, 2026

Context window

500K

1.31M

Max output

500K

131K

Input / 1MLowest provider price

$2.00

$0.07$0.07–$0.15 across 5

Output / 1MLowest provider price

$6.00

$0.25$0.25–$0.50 across 5

Providers

IntelligenceArtificial Analysis index

44.3

41.8

CodingArtificial Analysis index

76.8

71.5

Accepts

Text, Image

Text, Image, Video

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Yes

Grok 4.6 vs GLM-5.3-Flash: summary

Grok 4.6 and GLM-5.3-Flash are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

Grok 4.6, from xAI, has a 500,000-token context window, costs $2.00/1M input and $6.00/1M output tokens and scores 44.3 on the Artificial Analysis Intelligence Index.

GLM-5.3-Flash, from Z.ai, has a 1,310,720-token context window, costs from $0.07/1M input and $0.25/1M output tokens across 5 providers and scores 41.8 on the Artificial Analysis Intelligence Index.

GLM-5.3-Flash is the cheapest on input, 29× cheaper than the next model, GLM-5.3-Flash has the largest context window, Grok 4.6 scores highest for intelligence and Grok 4.6 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="x-ai/grok-4.6", messages=[...]) # or client.chat.completions.create(model="z-ai/glm-5.3-flash", messages=[...])

Full API docs

Frequently asked questions

More comparisons

Benchmark scores sourced from ArtificialAnalysis