How much can I save switching from GPT-oss 120B to DeepSeek V4 Flash?

You can save 7% on input and 53% on output tokens by switching. For a typical workload of 1M input + 500K output tokens per month, DeepSeek V4 Flash costs $0.66 vs $0.45 — saving $0.17/month.

Which model should I use: GPT-oss 120B or DeepSeek V4 Flash?

Choose DeepSeek V4 Flash for cost efficiency — it's 7% cheaper on input. Choose GPT-oss 120B if you need OpenAI ecosystem integration. GPT-oss 120B has 128K context vs DeepSeek V4 Flash's 1M.

Is DeepSeek V4 Flash still available?

DeepSeek V4 Flash was retired in September 2026. The legacy deepseek-v4-flash model name still accepts requests, but they are served by DeepSeek-V4.1-Flash and billed at its current Flash rates ($0.15 input / $0.60 output per 1M tokens off-peak, $0.30/$1.20 peak). The $0.22/$0.66 figures shown on this page are V4 Flash's pre-retirement prices, kept as a labeled historical comparison baseline.

GPT-oss 120B vs DeepSeek V4 Flash

Q: Is DeepSeek V4 Flash cheaper than GPT-oss 120B?

Yes, DeepSeek V4 Flash costs $0.22/$0.66 per 1M tokens while GPT-oss 120B costs $0.15/$0.6. That's 7% cheaper on input and 53% cheaper on output.

Side-by-side API pricing comparison: which model gives you more for less?

Last verified Jul 2026 · Prices per 1M tokens

Update (Oct 2, 2026): DeepSeek V4 Flash is retired. The legacy deepseek-v4-flash name still works, but requests are served by DeepSeek-V4.1-Flash and billed at $0.15/$0.60 off-peak — below the $0.22/$0.66 historical baseline used in this comparison. See the DeepSeek pricing guide for current numbers.

Quick Comparison

Feature	GPT-oss 120B	DeepSeek V4 Flash
Provider	OpenAI	DeepSeek
Tier	Budget	Budget
Input Price	$0.15	$0.22
Output Price	$0.6	$0.66
Context Window	128K	1M
Verified	May 2026	Jun 2026

When to Use Each

💰 Cost-Sensitive Workloads

High-volume APIs, batch processing, and startups watching runway.

→ Use DeepSeek V4 Flash — 7% cheaper input, 53% cheaper output

🧠 Complex Reasoning

Tasks requiring advanced reasoning, code generation, or nuanced analysis.

→ Either model works — compare quality on your specific tasks

⚡ High-Throughput APIs

Real-time chatbots, streaming responses, and latency-sensitive apps.

→ DeepSeek V4 Flash for cost at scale, GPT-oss 120B if quality matters more

🔬 Prototyping & Testing

Development, experimentation, and non-critical workloads.

→ Use DeepSeek V4 Flash — same context (128K), much cheaper

Track price changes for both models

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Frequently Asked Questions

Is DeepSeek V4 Flash cheaper than GPT-oss 120B?

Yes. DeepSeek V4 Flash ($0.22 input / $0.66 output per 1M tokens, while GPT-oss 120B costs $0.15 input / $0.6 output. That's 7% cheaper on input and 53% cheaper on output.

How much can I save switching to DeepSeek V4 Flash?

For a typical workload (1M input + 500K output tokens/month), DeepSeek V4 Flash costs $0.55/month vs $0.45/month for GPT-oss 120B. That's a savings of $0.17/month (53%).

Which should I choose: GPT-oss 120B or DeepSeek V4 Flash?

Choose DeepSeek V4 Flash for cost efficiency. Choose GPT-oss 120B for OpenAI ecosystem benefits. GPT-oss 120B has 128K context vs DeepSeek V4 Flash's 1M.