What is the difference between DeepSeek V4.1 Flash and GLM 5.1?

DeepSeek V4.1 Flash is developed by DeepSeek while GLM 5.1 is developed by Z.ai. DeepSeek V4.1 Flash has a 1.0M token context window vs GLM 5.1's 203K. You can compare their actual outputs across 6 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek V4.1 Flash or GLM 5.1?

It depends on your use case. DeepSeek V4.1 Flash and GLM 5.1 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 6 challenges so you can judge which fits your needs best.

How much does DeepSeek V4.1 Flash cost compared to GLM 5.1?

DeepSeek V4.1 Flash costs $0.15/M input tokens and GLM 5.1 costs $1.4/M input tokens. DeepSeek V4.1 Flash is $1.25/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare DeepSeek V4.1 Flash and GLM 5.1 on Rival?

This page shows a side-by-side comparison of DeepSeek V4.1 Flash and GLM 5.1 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Sep 2026

DeepSeek V4.1 FlashvsGLM 5.1

DeepSeek V4.1 Flash is cheaper than GLM 5.1 at $0.15/M vs $1.4/M input tokens.

DeepSeek V4.1 Flash and GLM 5.1 compared across 6 shared prompts
Spec	DeepSeek V4.1 Flash	GLM 5.1
Input price	$0.15/M tokens	$1.4/M tokens
Output price	$0.6/M tokens	$4.4/M tokens
Context window	1.0M tokens	203K tokens
Weights	Open	Open
Free API (OpenRouter)	No	No
Released	Sep 2026	Apr 2026

Our Verdict

DeepSeek V4.1 Flash

GLM 5.1Runner-up

Not enough votes to call it. On the specs, DeepSeek V4.1 Flash has the edge: newer, bigger context window, major provider backing.

DeepSeek V4.1 Flash costs 7.3x less per token.

Too close to call

API pricing

Cost per 1M tokens

DeepSeek V4.1 Flash

Input

$0.15

9.3× cheaper

Output

$0.60

7.3× cheaper

GLM 5.1

Input

$1.40

Output

$4.40

DeepSeek V4.1 Flash is cheaper on both: 9.3× input, 7.3× output.

Where to run it

37 hosts, cheapest first

DeepSeek V4.1 Flash23 hosts

HostInOutContextUptime

OpenInferencefp4$0.10 in$0.50 out1M99.5% up Wafer$0.12 in$0.60 out1M99.7% up Relacefp4$0.12 in$0.52 out1M99.9% up Morph$0.13 in$0.51 out1M98.4% up Sail Researchfp4$0.13 in$0.75 out1M99.9% up DeepInfrafp8$0.14 in$0.42 out1M99.7% up

17 more hosts

StreamLakefp8$0.15 in$0.60 out1M99.5% up CoreWeavefp8$0.20 in$0.65 out1M99.2% up Fireworks$0.22 in$0.66 out1M98.8% up Phala$0.28 in$1.10 out1M99.4% up GMI Cloudfp8$0.28 in$1.14 out1M99.6% up Novitafp8$0.28 in$1.14 out1M100% up Alibaba Cloud$0.30 in$1.20 out1M99.9% up AtlasCloudfp8$0.30 in$1.20 out1M99.7% up Basetenfp8$0.30 in$1.20 out1M99.4% up DeepSeek$0.30 in$1.20 out1M100% up DigitalOcean$0.30 in$1.20 out1M97.9% up Makora$0.30 in$1.20 out1M98.9% up Modal$0.30 in$1.20 out1M99.8% up SiliconFlowfp8$0.30 in$1.20 out1M99.8% up Together$0.30 in$1.20 out1M99.9% up Venicefp8$0.38 in$1.50 out1M96.7% up Parasailfp8degraded$0.30 in$1.20 out1M93% up

GLM 5.114 hosts

HostInOutContextUptime

StreamLakefp8$0.97 in$3.04 out200k99.5% up DeepInfrafp4$1.05 in$3.50 out203k99.6% up SiliconFlowfp8$1.19 in$3.74 out205k100% up AtlasCloudfp8$1.26 in$3.96 out203k99.7% up Alibaba Cloudfp8$1.33 in$4.18 out203k100% up Novitafp8$1.38 in$4.40 out205k99.8% up

8 more hosts

Baidu Qianfanfp8$1.40 in$4.40 out203k99.9% up Friendli$1.40 in$4.40 out203k100% up GMI Cloudfp8$1.40 in$4.40 out203k99.2% up Z.aifp8$1.40 in$4.40 out203k99.8% up Venicefp8$1.40 in$4.40 out200k97.7% up Chutesfp8degraded$0.98 in$3.08 out203k73.5% up Phaladegraded$1.21 in$4.20 out203k74.4% up Nebiusfp8degraded$1.40 in$4.40 out203k95.5% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Research

What we learned reading every model

FAQ

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Cost per 1M tokens

37 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and GLM 5.1?

Which is better, DeepSeek V4.1 Flash or GLM 5.1?

How much does DeepSeek V4.1 Flash cost compared to GLM 5.1?

How can I compare DeepSeek V4.1 Flash and GLM 5.1 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

37 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and GLM 5.1?

Which is better, DeepSeek V4.1 Flash or GLM 5.1?

How much does DeepSeek V4.1 Flash cost compared to GLM 5.1?

How can I compare DeepSeek V4.1 Flash and GLM 5.1 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages