Gemini 3.8 Flash vs GPT-5.1
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | Gemini 3.8 Flash | GPT-5.1 |
|---|---|---|
| Developer | Google Deepmind | Openai |
| Family | Gemini 3 | Gpt 5 1 |
| Model | Gemini 3.8 Flash | GPT-5.1 |
| Version | Gemini 3.8 Flash | GPT-5.1 |
| Lifecycle | active | active |
| Released | 2026-09-02 | 2025-11-13 |
| Knowledge cutoff | Unknown | 2024-09-30 |
| Input modalities | Unknown | Unknown |
| Output modalities | Unknown | Unknown |
| Context window | 1,048,576 | 400,000 |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Google AI (Standard), Google Gemini (Standard) | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, code_execution, computer_use, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, structured_outputs, tools |
12 comparable fields · 8 material differences · Interactive comparison only; indexing gate not met
Gemini 3.8 Flash Capabilities
GPT-5.1 Capabilities
Primary Evidence
Sources and Freshness
Questions
Gemini 3.8 Flash vs GPT-5.1 FAQs
Is Gemini 3.8 Flash or GPT-5.1 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Gemini 3.8 Flash and GPT-5.1, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Gemini 3.8 Flash or GPT-5.1?+
Gemini 3.8 Flash is $0.75 and GPT-5.1 is $1.25 per million tokens, so Gemini 3.8 Flash is cheaper on this metric. Gemini 3.8 Flash is $3.75 and GPT-5.1 is $10.00 per million tokens, so Gemini 3.8 Flash is cheaper on this metric.
Which has a larger context window, Gemini 3.8 Flash or GPT-5.1?+
Gemini 3.8 Flash has the larger sourced context window. Gemini 3.8 Flash supports 1,048,576 and GPT-5.1 supports 400,000.
Which performs better in benchmarks, Gemini 3.8 Flash or GPT-5.1?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Gemini 3.8 Flash or GPT-5.1 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Gemini 3.8 Flash is not marked open weight; GPT-5.1 is not marked open weight.
Can Gemini 3.8 Flash and GPT-5.1 understand images?+
Gemini 3.8 Flash is not documented with image input; GPT-5.1 is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Gemini 3.8 Flash or GPT-5.1?+
GPT-5.1 has the larger sourced maximum output: Gemini 3.8 Flash supports 65,536 and GPT-5.1 supports 128,000 output tokens.
Do Gemini 3.8 Flash and GPT-5.1 support reasoning and tool use?+
Gemini 3.8 Flash: reasoning and tool calling. GPT-5.1: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, Gemini 3.8 Flash or GPT-5.1?+
Gemini 3.8 Flash has 2 sourced provider routes; GPT-5.1 has 2, a tie.
Which offers better value, Gemini 3.8 Flash or GPT-5.1?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.