How much can I save switching from GPT-oss 120B to GPT-oss 20B?

You can save 47% on input and 42% on output tokens by switching. For a typical workload of 1M input + 500K output tokens per month, GPT-oss 20B costs $0.26 vs $0.45 — saving $0.19/month.

Which model should I use: GPT-oss 120B or GPT-oss 20B?

Choose GPT-oss 20B for cost efficiency — it's 47% cheaper on input. Choose GPT-oss 120B if you need OpenAI ecosystem integration. Both have 128K context windows.

GPT-oss 120B vs GPT-oss 20B

Q: Is GPT-oss 20B cheaper than GPT-oss 120B?

Yes, GPT-oss 20B costs $0.08/$0.35 per 1M tokens while GPT-oss 120B costs $0.15/$0.6. That's 47% cheaper on input and 42% 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	GPT-oss 20B
Provider	OpenAI	OpenAI
Tier	Budget	Budget
Input Price	$0.15	$0.08
Output Price	$0.6	$0.35
Context Window	128K	128K
Verified	May 2026	May 2026

When to Use Each

💰 Cost-Sensitive Workloads

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

→ Use GPT-oss 20B — 47% cheaper input, 42% 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.

→ GPT-oss 20B for cost at scale, GPT-oss 120B if quality matters more

🔬 Prototyping & Testing

Development, experimentation, and non-critical workloads.

→ Use GPT-oss 20B — 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 GPT-oss 20B prices change.

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Frequently Asked Questions

Is GPT-oss 20B cheaper than GPT-oss 120B?

Yes. GPT-oss 20B costs $0.08 input / $0.35 output per 1M tokens, while GPT-oss 120B costs $0.15 input / $0.6 output. That's 47% cheaper on input and 42% cheaper on output.

How much can I save switching to GPT-oss 20B?

For a typical workload (1M input + 500K output tokens/month), GPT-oss 20B costs $0.26/month vs $0.45/month for GPT-oss 120B. That's a savings of $0.19/month (47%).

Which should I choose: GPT-oss 120B or GPT-oss 20B?

Choose GPT-oss 20B for cost efficiency. Choose GPT-oss 120B for OpenAI ecosystem benefits. Both have 128K context windows.