AI model comparison
gpt-oss-20b vs Gemini 2.5 Flash Lite
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
OpenAI
gpt-oss-20b
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license.
- Input / 1M
- $0.02
- Output / 1M
- $0.09
- Context
- 131K
Gemini 2.5 Flash Lite
Gemini 2.5 Flash-Lite is a lightweight reasoning model in the Gemini 2.5 family, optimized for ultra-low latency and cost efficiency.
Gemini 2.5 Flash Lite is scheduled to be retired on October 20, 2026. Consider Gemini 3.1 Flash Lite instead.
- Input / 1M
- $0.10
- Output / 1M
- $0.40
- Context
- 1.05M
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
gpt-oss-20b
4.9x cheaper for a typical chat
Higher intelligence score
Gemini 2.5 Flash Lite
10.4 vs 10 on Artificial Analysis
Larger context window
Gemini 2.5 Flash Lite
1.05M vs 131K tokens
Newer release
gpt-oss-20b
Released August 5, 2025
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
gpt-oss-20b10Gemini 2.5 Flash Lite10.4Coding index
gpt-oss-20bNot availableGemini 2.5 Flash LiteNot availableAgentic index
gpt-oss-20bNot availableGemini 2.5 Flash LiteNot availablePricing
gpt-oss-20b vs Gemini 2.5 Flash Lite API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | gpt-oss-20b | Gemini 2.5 Flash Lite |
|---|---|---|
| Input tokensPer 1M tokens | $0.02 | $0.10 |
| Output tokensPer 1M tokens | $0.09 | $0.40 |
| Cached input (read)Per 1M tokens | $0.01 | $0.01 |
| Cache writePer 1M tokens | Not available | $0.08 |
| Web searchPer request | Not available | $0.014 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
gpt-oss-20b$0.08Gemini 2.5 Flash Lite$0.40Coding task
30K in, 4K out
gpt-oss-20b$0.90$0.63 cachedGemini 2.5 Flash Lite$4.60$1.90 cachedLong document summary
150K in, 2K out
gpt-oss-20b$2.88$1.53 cachedGemini 2.5 Flash Lite$15.80$2.30 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | gpt-oss-20b | Gemini 2.5 Flash Lite |
|---|---|---|
| Context window | 131K tokens | 1.05M tokens |
| Max output | 33K tokens | 66K tokens |
| Input types | Text | Audio, File, Image, Text, Video |
| Output types | Text | Text |
| Reasoning effort levels | High, Medium, Low | Not available |
| Default reasoning effort | Medium | Not available |
| Release date | August 5, 2025 | July 22, 2025 |
Features
Supported features
API features available for each model.
| Metric | gpt-oss-20b | Gemini 2.5 Flash Lite |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Gemini 2.5 Flash LiteView full model details- Gemini 2.5 Flash Lite vs gpt-oss-120b
- Gemini 2.5 Flash Lite vs Gemma 4 31B
- Gemini 2.5 Flash Lite vs Gemma 4 26B A4B
- Gemini 2.5 Flash Lite vs GPT-5 Nano
- Gemini 2.5 Flash Lite vs GPT-4.1 Mini
- Gemini 2.5 Flash Lite vs Qwen3 235B A22B Instruct 2507
- Gemini 2.5 Flash Lite vs Gemma 3 27B
- Gemini 2.5 Flash Lite vs Mercury 2.5
- Gemini 2.5 Flash Lite vs Qwen3 30B A3B Instruct 2507
- Gemini 2.5 Flash Lite vs Llama 3.3 70B Instruct
- Gemini 2.5 Flash Lite vs Qwen3.5-9B
- Gemini 2.5 Flash Lite vs Nemotron 3.5 Lightning
- Gemini 2.5 Flash Lite vs Qwen3 Coder Next
- Gemini 2.5 Flash Lite vs DeepSeek V3 0324
- Gemini 2.5 Flash Lite vs GPT-4.1 Nano
- Gemini 2.5 Flash Lite vs Granite 4.2 8B
- Gemini 2.5 Flash Lite vs Llama 4 Maverick
- Gemini 2.5 Flash Lite vs Qwen3 32B
- Gemini 2.5 Flash Lite vs Qwen3 Coder 480B A35B
- Gemini 2.5 Flash Lite vs GLM 4.7 Flash
- Gemini 2.5 Flash Lite vs DeepSeek V3.2 Exp
- Gemini 2.5 Flash Lite vs Nemotron 3 Super
- Gemini 2.5 Flash Lite vs GLM 4.5 Air
- Gemini 2.5 Flash Lite vs Gemma 3 12B
- Gemini 2.5 Flash Lite vs Mistral Small 4
- Gemini 2.5 Flash Lite vs Llama 4 Scout
- Gemini 2.5 Flash Lite vs Qwen3 Coder 30B A3B Instruct
- Gemini 2.5 Flash Lite vs Qwen3 14B
- Gemini 2.5 Flash Lite vs Nemotron 3 Nano 30B A3B
- Gemini 2.5 Flash Lite vs Qwen2.5 72B Instruct
- Gemini 2.5 Flash Lite vs Mercury 2
- Gemini 2.5 Flash Lite vs Llama 3.1 70B Instruct
- Gemini 2.5 Flash Lite vs GLM 4.6V
- Gemini 2.5 Flash Lite vs Trinity Large Thinking
- Gemini 2.5 Flash Lite vs Solar Pro 3
Our take
gpt-oss-20b is 4.9x cheaper for a typical chat. Gemini 2.5 Flash Lite scores higher on the Artificial Analysis Intelligence Index (10.4 vs 10). Gemini 2.5 Flash Lite has the larger context window (1.05M vs 131K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is gpt-oss-20b or Gemini 2.5 Flash Lite cheaper?
gpt-oss-20b is cheaper for a typical chat (2K input tokens and 500 output tokens). gpt-oss-20b costs $0.02 per 1M input tokens and $0.09 per 1M output tokens, while Gemini 2.5 Flash Lite costs $0.10 per 1M input tokens and $0.40 per 1M output tokens.
Which has a bigger context window, gpt-oss-20b or Gemini 2.5 Flash Lite?
Gemini 2.5 Flash Lite supports up to 1.05M tokens of context, compared with 131K for gpt-oss-20b.
Is gpt-oss-20b smarter than Gemini 2.5 Flash Lite?
On the Artificial Analysis Intelligence Index, gpt-oss-20b scores 10 and Gemini 2.5 Flash Lite scores 10.4, putting Gemini 2.5 Flash Lite ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use gpt-oss-20b and Gemini 2.5 Flash Lite at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see gpt-oss-20b and Gemini 2.5 Flash Lite answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to gpt-oss-20b and Gemini 2.5 Flash Lite at the same time. Compare the answers side by side and keep the best one.