API cost decision in 10 seconds

gpt-oss-120b (free) vs Gemini 2.0 Flash

Pick gpt-oss-120b (free) for lower cost; pick Gemini 2.0 Flash only if the larger context window matters more.

Page updated: 2026-05-26T15:08:08Z Data confirmed: 2026-05-26T19:08:13Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick gpt-oss-120b (free) for lower cost; pick Gemini 2.0 Flash only if the larger context window matters more.

On the standard 1M input plus 500K output workload, gpt-oss-120b (free) is estimated at $0 vs $0.3 for Gemini 2.0 Flash, saving $0.3 (100% lower).

Cost-first pickgpt-oss-120b (free)

Context-first pickGemini 2.0 Flash

Sample savings$0.3100%

10x traffic gap$3

Gemini 2.0 Flash has more context, but gpt-oss-120b (free) saves $0.3 on the standard workload. At 10x that traffic, the same price gap is about $3. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

gpt-oss-120b (free) stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	gpt-oss-120b (free)	Gemini 2.0 Flash
Input-heavy / RAG	5M input + 500K output	gpt-oss-120b (free)	$0	$0.7
Balanced workload	1M input + 1M output	gpt-oss-120b (free)	$0	$0.5
Output-heavy chatbot	1M input + 5M output	gpt-oss-120b (free)	$0	$2.1

Cheaper input gpt-oss-120b (free) $0 vs $0.1 / 1M

gpt-oss-120b (free) is free for input tokens while Gemini 2.0 Flash costs $0.1 per 1M tokens.

Cheaper output gpt-oss-120b (free) $0 vs $0.4 / 1M

gpt-oss-120b (free) is free for output tokens while Gemini 2.0 Flash costs $0.4 per 1M tokens.

Larger context Gemini 2.0 Flash 131.07K vs 1M

Gemini 2.0 Flash has 868.93K more context (7.63x larger).

Sample workload gpt-oss-120b (free) $0 vs $0.3

gpt-oss-120b (free) is free for the standard workload while the other model is estimated at $0.3.

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

gpt-oss-120b (free) Calculating… Estimated API cost

Gemini 2.0 Flash 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

gpt-oss-120b (free) has the lower input price; gpt-oss-120b (free) has the lower output price; Gemini 2.0 Flash offers the larger context window. For the 1M input plus 500K output sample, gpt-oss-120b (free) is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $0 for gpt-oss-120b (free) and $0.3 for Gemini 2.0 Flash.

Best Fit

Choose gpt-oss-120b (free) when you care most about lower input-token price, and lower output-token price.

Choose Gemini 2.0 Flash when you care most about larger context window.

Decision Notes

On the standard 1M input plus 500K output workload, gpt-oss-120b (free) is estimated at $0 vs $0.3 for Gemini 2.0 Flash, saving $0.3 (100% lower).
gpt-oss-120b (free) is free for the standard workload while the other model is estimated at $0.3.
gpt-oss-120b (free) is free for input tokens while Gemini 2.0 Flash costs $0.1 per 1M tokens.
gpt-oss-120b (free) is free for output tokens while Gemini 2.0 Flash costs $0.4 per 1M tokens.
Gemini 2.0 Flash has 868.93K more context (7.63x larger).

Head-to-Head Specs

Feature	gpt-oss-120b (free) (OpenAI)	Gemini 2.0 Flash (Google)
Input Price prompt tokens per 1M	$0	$0.1
Completion Price per 1M tokens	$0	$0.4
Sample Workload Cost 1M input + 500K output	$0	$0.3
Context Window	131.07K	1M
Release Date	2025-08-05	2025-02-05
Popularity	#26	#46

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	gpt-oss-120b (free)	On the standard 1M input plus 500K output workload, gpt-oss-120b (free) is estimated at $0 vs $0.3 for Gemini 2.0 Flash, saving $0.3 (100% lower).
High-volume input processing	gpt-oss-120b (free)	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	gpt-oss-120b (free)	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Gemini 2.0 Flash	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

Gemma 4 31B (free) can replace Gemini 2.0 Flash when lower sample workload cost matters most: $0.
Gemma 4 26B A4B (free) can replace Gemini 2.0 Flash when lower sample workload cost matters most: $0.
Lyria 3 Clip Preview can replace Gemini 2.0 Flash when lower sample workload cost matters most: $0.
Lyria 3 Pro Preview can replace Gemini 2.0 Flash when lower sample workload cost matters most: $0.

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.
DeepSeek V4 Flash offers 1.05M context with $0.2 sample workload cost.
Gemini 2.5 Flash Lite offers 1.05M context with $0.3 sample workload cost.

Popular competitors

DeepSeek V4 Flash · DeepSeek · #1
Hy3 preview · Tencent · #2
Claude Opus 4.7 · Anthropic · #3
Claude Sonnet 4.6 · Anthropic · #4

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OpenAI catalog

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Google catalog

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gpt-oss-120b (free)

gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases. It activates 5.1B parameters per forward pass and is optimized...

Gemini 2.0 Flash

Gemini Flash 2.0 offers a significantly faster time to first token (TTFT) compared to [Gemini Flash 1.5](/google/gemini-flash-1.5), while maintaining quality on par with larger models like [Gemini Pro 1.5](/google/gemini-pro-1.5). It...