API cost decision in 10 seconds

🔥DeepSeek V4 Flash vs Qwen3.5-9B

Pick Qwen3.5-9B for lower cost; pick DeepSeek V4 Flash only if the larger context window matters more.

Pricing data updated: 2026-05-16T17:16:02Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Qwen3.5-9B for lower cost; pick DeepSeek V4 Flash only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Qwen3.5-9B is estimated at $0.11 vs $0.22 for DeepSeek V4 Flash, saving $0.11 (48.7% lower).

Cost-first pickQwen3.5-9B

Context-first pickDeepSeek V4 Flash

Sample savings$0.1148.7%

10x traffic gap$1.09

DeepSeek V4 Flash has more context, but Qwen3.5-9B saves $0.11 on the standard workload. At 10x that traffic, the same price gap is about $1.09. Use the calculator below to replace the sample workload with your own token volume.

Cheaper input Qwen3.5-9B $0.112 vs $0.04 / 1M

Qwen3.5-9B is $0.07 cheaper per 1M input tokens (64.3% lower; 2.8x difference).

Cheaper output Qwen3.5-9B $0.224 vs $0.15 / 1M

Qwen3.5-9B is $0.07 cheaper per 1M output tokens (33% lower; 1.49x difference).

Larger context DeepSeek V4 Flash 1.05M vs 262.14K

DeepSeek V4 Flash has 786.43K more context (4x larger).

Sample workload Qwen3.5-9B $0.22 vs $0.11

Qwen3.5-9B is $0.11 cheaper on the standard workload (48.7% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

DeepSeek V4 Flash Calculating… Estimated API cost

Qwen3.5-9B Calculating… Estimated API cost

Cheaper for this workload Calculating… Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

Qwen3.5-9B has the lower input price; Qwen3.5-9B has the lower output price; DeepSeek V4 Flash offers the larger context window. For the 1M input plus 500K output sample, Qwen3.5-9B is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $0.22 for DeepSeek V4 Flash and $0.11 for Qwen3.5-9B.

Best Fit

Choose DeepSeek V4 Flash when you care most about larger context window.

Choose Qwen3.5-9B when you care most about lower input-token price, and lower output-token price.

Decision Notes

On the standard 1M input plus 500K output workload, Qwen3.5-9B is estimated at $0.11 vs $0.22 for DeepSeek V4 Flash, saving $0.11 (48.7% lower).
Qwen3.5-9B is $0.11 cheaper on the standard workload (48.7% lower).
Qwen3.5-9B is $0.07 cheaper per 1M input tokens (64.3% lower; 2.8x difference).
Qwen3.5-9B is $0.07 cheaper per 1M output tokens (33% lower; 1.49x difference).
DeepSeek V4 Flash has 786.43K more context (4x larger).

Head-to-Head Specs

Feature	🔥DeepSeek V4 Flash (DeepSeek)	Qwen3.5-9B (Qwen)
Input Price prompt tokens per 1M	$0.112	$0.04
Completion Price per 1M tokens	$0.224	$0.15
Sample Workload Cost 1M input + 500K output	$0.22	$0.11
Context Window	1.05M	262.14K
Release Date	2026-04-24	2026-03-10
Popularity Rank current rank	#1	Unranked

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Qwen3.5-9B	On the standard 1M input plus 500K output workload, Qwen3.5-9B is estimated at $0.11 vs $0.22 for DeepSeek V4 Flash, saving $0.11 (48.7% lower).
High-volume input processing	Qwen3.5-9B	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Qwen3.5-9B	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	DeepSeek V4 Flash	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

DeepSeek V4 Flash (free) can replace DeepSeek V4 Flash when lower sample workload cost matters most: $0.
Qwen3 Next 80B A3B Instruct (free) can replace Qwen3.5-9B when lower sample workload cost matters most: $0.
Qwen3 Coder 480B A35B (free) can replace Qwen3.5-9B when lower sample workload cost matters most: $0.
Qwen2.5 7B Instruct can replace Qwen3.5-9B when lower sample workload cost matters most: $0.09.

Larger context near this budget

Llama 4 Scout offers 10M context with $0.23 sample workload cost.
Owl Alpha offers 1.05M context with $0 sample workload cost.

Popular competitors

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Cheaper alternatives

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Larger context alternatives

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Provider catalogs

Compare models within provider hubs before choosing a final API vendor.

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DeepSeek catalog

Review all tracked DeepSeek models before deciding whether this matchup is the right shortlist.

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Qwen catalog

Check other Qwen models with comparable pricing, context, or release timing.

Open Qwen models

DeepSeek V4 Flash

DeepSeek V4 Flash is an efficiency-optimized Mixture-of-Experts model from DeepSeek with 284B total parameters and 13B activated parameters, supporting a 1M-token context window. It is designed for fast inference and...

Qwen3.5-9B

Qwen3.5-9B is a multimodal foundation model from the Qwen3.5 family, designed to deliver strong reasoning, coding, and visual understanding in an efficient 9B-parameter architecture. It uses a unified vision-language design...