Which is cheaper, Nemotron 3 Ultra 550B A55B and GLM-5.3-Flash?

GLM-5.3-Flash has the lowest input price. Per 1M input tokens: Nemotron 3 Ultra 550B A55B from $0.50 and GLM-5.3-Flash from $0.07.

Which has the larger context window, Nemotron 3 Ultra 550B A55B and GLM-5.3-Flash?

GLM-5.3-Flash has the largest context window: Nemotron 3 Ultra 550B A55B 262,144 tokens and GLM-5.3-Flash 1,310,720 tokens.

Which is smarter, Nemotron 3 Ultra 550B A55B and GLM-5.3-Flash?

GLM-5.3-Flash scores highest on the Artificial Analysis Intelligence Index: Nemotron 3 Ultra 550B A55B 11.8 and GLM-5.3-Flash 27.8.

Can I switch between Nemotron 3 Ultra 550B A55B 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 (nvidia/nemotron-3-ultra-550b-a55b, z-ai/glm-5.3-flash).

Nemotron 3 Ultra 550B A55B vs GLM-5.3-Flash

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

Estimate monthly cost for these models

Nemotron 3 Ultra 550B A55B NVIDIAnvidia/nemotron-3-ultra-550b-a55b

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

Creator

NVIDIA

Z.ai

Released

May 16, 2026

Aug 26, 2026

Context window

262K

1.31M

Max output

16K

131K

Input / 1MLowest provider price

$0.50

$0.07$0.07–$0.15 across 5

Output / 1MLowest provider price

$2.20

$0.25$0.25–$0.50 across 5

Providers

IntelligenceArtificial Analysis index

11.8

27.8

Accepts

Text

Text, Image, Video

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Yes

Nemotron 3 Ultra 550B A55B vs GLM-5.3-Flash: summary

Nemotron 3 Ultra 550B A55B 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.

Nemotron 3 Ultra 550B A55B, from NVIDIA, has a 262,144-token context window, costs $0.50/1M input and $2.20/1M output tokens and scores 11.8 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 27.8 on the Artificial Analysis Intelligence Index.

GLM-5.3-Flash is the cheapest on input, 7.1× cheaper than the next model, GLM-5.3-Flash has the largest context window and GLM-5.3-Flash scores highest for intelligence.

Switch with one line

client = OpenAI(base_url="https://api.fastrouter.ai/api/v1", api_key="<FASTROUTER_API_KEY>") client.chat.completions.create(model="nvidia/nemotron-3-ultra-550b-a55b", messages=[...]) # or client.chat.completions.create(model="z-ai/glm-5.3-flash", messages=[...])

Full API docs

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Benchmark scores sourced from ArtificialAnalysis