Gemini 3.8 Flash vs GPT-6 Astra
Why this pair: OpenAI's flagship versus the current Google model included in its launch comparisons
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | Gemini 3.8 Flash | GPT-6 Astra |
|---|---|---|
| Developer | Google DeepMind | OpenAI |
| Family | Gemini 3 | Gpt 6 |
| Model | Gemini 3.8 Flash | GPT-6 Astra |
| Version | Gemini 3.8 Flash | GPT-6 Astra |
| Lifecycle | active | active |
| Released | 2026-09-02 | 2026-09-03 |
| Knowledge cutoff | Unknown | 2026-04-30 |
| Input modalities | Text, Image, Video, Audio, Document | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,049K | 1,050K |
| 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, computer-use, generation, reasoning, research, tools |
14 comparable fields · 9 material differences · Editorially curated pair passes the primary-source comparison gate
Gemini 3.8 Flash Capabilities
GPT-6 Astra Capabilities
Internal Comparison Graph
Related Comparisons
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|---|---|---|---|
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 MiniMax-M3MiniMax | vs | Gemini 3.8 FlashGoogle DeepMind | cross-developer peerstext |
Gemini 3.8 FlashGoogle DeepMind | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Gemini 3.8 FlashGoogle DeepMind | vs |  Hy4 previewTencent | cross-developer peerstext |
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Gemini 3.8 FlashGoogle DeepMind | vs |  Mistral Large 3Mistral AI | cross-developer peerstext |
Primary Evidence
Sources and Freshness
Questions
Gemini 3.8 Flash vs GPT-6 Astra FAQs
Is Gemini 3.8 Flash or GPT-6 Astra better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Gemini 3.8 Flash and GPT-6 Astra, 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-6 Astra?+
Gemini 3.8 Flash is $0.75 and GPT-6 Astra is $10.00 per million tokens, so Gemini 3.8 Flash is cheaper on this metric. Gemini 3.8 Flash is $3.75 and GPT-6 Astra is $50.00 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-6 Astra?+
GPT-6 Astra has the larger sourced context window. Gemini 3.8 Flash supports 1,049K and GPT-6 Astra supports 1,050K.
Which performs better in benchmarks, Gemini 3.8 Flash or GPT-6 Astra?+
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-6 Astra be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Gemini 3.8 Flash is not marked open weight; GPT-6 Astra is not marked open weight.
Can Gemini 3.8 Flash and GPT-6 Astra understand images?+
Gemini 3.8 Flash is documented with image input; GPT-6 Astra is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Gemini 3.8 Flash or GPT-6 Astra?+
GPT-6 Astra has the larger sourced maximum output: Gemini 3.8 Flash supports 66K and GPT-6 Astra supports 128K output tokens.
Do Gemini 3.8 Flash and GPT-6 Astra support reasoning and tool use?+
Gemini 3.8 Flash: reasoning, tool calling, and image input. GPT-6 Astra: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Gemini 3.8 Flash or GPT-6 Astra?+
Gemini 3.8 Flash has 2 sourced provider routes; GPT-6 Astra has 2, a tie.
Which offers better value, Gemini 3.8 Flash or GPT-6 Astra?+
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.