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 $0.28 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.

GPT-oss 120B vs DeepSeek V4 Flash

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

Yes, DeepSeek V4 Flash costs $0.14/$0.28 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 May 2026 · Prices per 1M tokens

Quick Comparison

Feature	GPT-oss 120B	DeepSeek V4 Flash
Provider	OpenAI	DeepSeek
Tier	Budget	Budget
Input Price	$0.15	$0.14
Output Price	$0.6	$0.28
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

APIpulse Pro monitors 49 models across 10 providers. Get alerts when GPT-oss 120B or DeepSeek V4 Flash prices change.

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Frequently Asked Questions

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

Yes. DeepSeek V4 Flash costs $0.14 input / $0.28 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 $0.28/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.