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Gemini 3.8 Flash vs GPT-6 Astra
GPT-6 Astra scores higher than Gemini 3.8 Flash on all 5 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 3.8 Flash is at 50 and GPT-6 Astra at 91.5 (out of 100).
Scores as published by each board; table composed September 28, 2026.
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Leaderboard by leaderboard
| Board | Gemini 3.8 Flash | GPT-6 Astra | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,580 | 1,791.7 | GPT-6 Astra |
| LiveBench global average (0-100) | 75.8 | 82.2 | GPT-6 Astra |
| SimpleBench AVG@5 % (private set) | 82.4 | 86.5 | GPT-6 Astra |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 62.3 | 66.6 | GPT-6 Astra |
| Artificial Analysis intelligence index · measured runs only | 40.9 | 52.7 | GPT-6 Astra |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
For coding
On the ArtificialWatch coding index, Gemini 3.8 Flash is at 50 (#15 of 31) and GPT-6 Astra at 90 (#4). GPT-6 Astra scores higher on all 3 coding boards that rate both.
| Coding board | Gemini 3.8 Flash | GPT-6 Astra |
|---|---|---|
| LMArena · Coding | 1,532.1 | 1,542.3 |
| LiveBench · Coding | 63.4 | 68.8 |
| Vals Vibe Code Bench | 78.7 | 89.6 |
Gemini 3.8 Flash at a glance
- Developer
- Status
- Live since September 2, 2026
- API price
- $0.75 input / $3.75 output per 1M tokens · Google, gemini-3.8-flash
- Context window
- 1.05M tokens
Live — GA Sep 2 · $0.75/$3.75 per 1M introductory through Dec 31, identical to 3.7 · 1M in / 64K out · 'our most intelligent Flash model' · 20 days after 3.7.
Gemini 3.8 Flash is GA — same price as 3.7, twenty days later
2026-09-02 · Google released Gemini 3.8 Flash today. The Gemini API changelog for September 2 reads: "Gemini 3.8 Flash generally available (GA): Released gemini-3.8-flash, our most intelligent Flash model, engineered for long-horizon software engineering, autonomous agents, and complex enterprise workflows."
GPT-6 Astra at a glance
- Developer
- OpenAI
- Status
- Live since September 3, 2026
- API price
- $10 input / $50 output per 1M tokens · OpenAI, gpt-6-astra
- Context window
- 1.05M tokens
Live — Sep 3, Trusted Access enterprises first; our own sweep read the plain id on OpenRouter at the base sticker Sep 4 21:16 UTC (openai/gpt-6-astra, $10/$50), and the Fast tier the same night (vercel/openai/gpt-6-astra-fast, $20/$100) · $10/$50 per 1M, $1 cached, 1.05M ctx / 128K out · AA Coding Agent Index 67 (≈ Opus 5, Fable 5), Intelligence Index 61 (= GPT-5.6 Sol, 5 below Fable 5.1).
GPT-6 Astra is out — Fable 5.1's sticker, trusted access first, public API within days
2026-09-03 · OpenAI shipped GPT-6 Astra today. Its own words, from the model documentation: "Our most capable model, built for the hardest end-to-end work" — complex reasoning, coding, computer use, research and document creation.
OpenAI is treating Astra as its first Critical cyber model — and slowing it down, 24 hours after the leaks said next week
2026-08-07 · Twenty-four hours ago both accounts we track said Astra was launching next week. Today OpenAI published that it is slowing the model down, and the reason outranks any launch calendar.
Gemini 3.8 Flash vs GPT-6 Astra: quick answers
Which is better, Gemini 3.8 Flash or GPT-6 Astra?
It depends on what you measure. GPT-6 Astra scores higher than Gemini 3.8 Flash on all 5 public leaderboards that rate both. GPT-6 Astra's widest lead is on LMArena. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 3.8 Flash is at 50 and GPT-6 Astra at 91.5 (out of 100).
Which is newer, Gemini 3.8 Flash or GPT-6 Astra?
GPT-6 Astra. It went live on September 3, 2026, 1 day after Gemini 3.8 Flash (September 2, 2026).
Which is cheaper, Gemini 3.8 Flash or GPT-6 Astra?
Gemini 3.8 Flash is cheaper on both input and output. On each vendor's own API, Gemini 3.8 Flash is $0.75 input / $3.75 output per million tokens and GPT-6 Astra is $10 input / $50 output per million tokens. GPT-6 Astra's rate rises for prompts over 272K tokens. Prices as published in the models.dev catalog, as of 2026-09-27.
Which has the bigger context window, Gemini 3.8 Flash or GPT-6 Astra?
GPT-6 Astra, at 1.05M tokens against Gemini 3.8 Flash's 1.05M, as each vendor lists it.
How do Gemini 3.8 Flash and GPT-6 Astra compare for coding?
On the ArtificialWatch coding index, Gemini 3.8 Flash is at 50 (#15 of 31) and GPT-6 Astra at 90 (#4). GPT-6 Astra scores higher on all 3 coding boards that rate both.
Who makes Gemini 3.8 Flash and GPT-6 Astra?
Gemini 3.8 Flash is from Google; GPT-6 Astra is from OpenAI.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed September 28, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · the wire