What is the difference between DeepSeek V4.1 Flash and GPT OSS 20B?

DeepSeek V4.1 Flash is developed by DeepSeek while GPT OSS 20B is developed by OpenAI. DeepSeek V4.1 Flash has a 1.0M token context window vs GPT OSS 20B's 131K. 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 GPT OSS 20B?

It depends on your use case. DeepSeek V4.1 Flash and GPT OSS 20B 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 GPT OSS 20B?

DeepSeek V4.1 Flash costs $0.15/M input tokens and GPT OSS 20B costs $0.02/M input tokens. GPT OSS 20B is $0.13/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 GPT OSS 20B on Rival?

This page shows a side-by-side comparison of DeepSeek V4.1 Flash and GPT OSS 20B 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 FlashvsGPT OSS 20B

GPT OSS 20B is cheaper than DeepSeek V4.1 Flash at $0.02/M vs $0.15/M input tokens.

DeepSeek V4.1 Flash and GPT OSS 20B compared across 6 shared prompts
Spec	DeepSeek V4.1 Flash	GPT OSS 20B
Input price	$0.15/M tokens	$0.02/M tokens
Output price	$0.6/M tokens	$0.1/M tokens
Context window	1.0M tokens	131K tokens
Weights	Open	Open
Free API (OpenRouter)	No	No
Released	Sep 2026	Aug 2025

Our Verdict

DeepSeek V4.1 Flash

GPT OSS 20BRunner-up

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

GPT OSS 20B costs 6.0x less per token.

Too close to call

API pricing

Cost per 1M tokens

DeepSeek V4.1 Flash

Input

$0.15

Output

$0.60

GPT OSS 20B

Input

$0.02

7.5× cheaper

Output

$0.10

6.0× cheaper

GPT OSS 20B is cheaper on both: 7.5× input, 6.0× output.

Where to run it

34 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

GPT OSS 20B11 hosts

HostInOutContextUptime

Darkbloomfp8$0.02 in$0.09 out131k99.8% up AkashMLfp4$0.02 in$0.10 out131k99.3% up DekaLLMbf16$0.03 in$0.14 out131k99.7% up CoreWeavefp4$0.03 in$0.13 out131k100% up DeepInfrabf16$0.03 in$0.14 out131k99.9% up Parasailfp4$0.03 in$0.15 out131k99.9% up

5 more hosts

Novitafp4$0.04 in$0.15 out131k99.5% up Amazon Bedrock$0.07 in$0.15 out131k96.2% up Google Vertex AI$0.07 in$0.25 out131k98.1% up Groq$0.07 in$0.30 out131k99.7% up SiliconFlowfp8degraded$0.04 in$0.18 out131k95.4% up

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

Research

What we learned reading every model

FAQ

Common questions

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More comparisons

Cost per 1M tokens

34 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and GPT OSS 20B?

Which is better, DeepSeek V4.1 Flash or GPT OSS 20B?

How much does DeepSeek V4.1 Flash cost compared to GPT OSS 20B?

How can I compare DeepSeek V4.1 Flash and GPT OSS 20B on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

34 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and GPT OSS 20B?

Which is better, DeepSeek V4.1 Flash or GPT OSS 20B?

How much does DeepSeek V4.1 Flash cost compared to GPT OSS 20B?

How can I compare DeepSeek V4.1 Flash and GPT OSS 20B on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages