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Gemini 4 Hydrogen vs GPT-6 Luna
Gemini 4 Hydrogen scores higher than GPT-6 Luna on all 4 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 4 Hydrogen is at 81.9 and GPT-6 Luna at 26.7 (out of 100). On each maker's API, Gemini 4 Hydrogen costs $1.50 / $7.50 per 1M tokens (input / output) and GPT-6 Luna $0.10 / $0.50.
Scores as published by each board; table composed November 13, 2026.
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Leaderboard by leaderboard
| Board | Gemini 4 Hydrogen | GPT-6 Luna | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,704.2 | 1,577.2 | Gemini 4 Hydrogen |
| LiveBench global average (0-100) | 77 | 60.4 | Gemini 4 Hydrogen |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 68.5 | 52.3 | Gemini 4 Hydrogen |
| Artificial Analysis intelligence index · measured runs only | 53.9 | 27.9 | Gemini 4 Hydrogen |
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 4 Hydrogen is at 76 (#10 of 48) and GPT-6 Luna at 33.3 (#33). Gemini 4 Hydrogen scores higher on all 3 coding boards that rate both.
| Coding board | Gemini 4 Hydrogen | GPT-6 Luna |
|---|---|---|
| LMArena · Coding | 1,515.9 | 1,431.2 |
| LiveBench · Coding | 78.5 | 70.8 |
| Vals Vibe Code Bench | 87.8 | 81.6 |
Gemini 4 Hydrogen at a glance
- Developer
- Status
- Live since November 12, 2026
- API price
- $1.50 input / $7.50 output per 1M tokens · Google, gemini-4-hydrogen
- Context window
- 1.05M tokens
Live — Nov 12 · GA on the Gemini API as gemini-4-hydrogen (Google's release notes, Nov 12), free tier and paid tier, also in Google AI Studio and the default model for the Antigravity agent in Gemini Managed Agents · $1.50 / $7.50 per 1M, $0.075 cached (implicit caching only); Batch and Flex $0.75 / $3.75; Priority $2.70 / $13.50 · no introductory discount: the same as the SKU rows Google Cloud listed at 08:50 UTC · 1M unified context; 65,536 max output by default, up to 1M with long decode · text, image, video, audio and PDF in, text out · thinking levels low, medium, high (default) and a new xhigh · Google calls Gemini 3.8 Flash its 'previous-generation Flash model' ($0.75 / $3.75 intro through Dec 31, $1.50 / $7.50 from Jan 1) · our sweep fired at 17:46 UTC · before launch: codename reported since Oct 27, Business Insider (Nov 11) on staff testing, billing SKUs Nov 12 08:50 UTC · Nov 12 18:50 UTC: 54 on Artificial Analysis' Intelligence Index (Gemini 4 Hydrogen (Xhigh)), above Gemini 4 Argon (50) and GPT-6.1 Terra (51), one point under Claude Sonnet 5.5 (55); 54.3% on CursorBench at High, 12th of its listed settings.
Gemini 4 Hydrogen is live: Google's new everyday model costs $1.50 / $7.50 per 1M tokens, with a free tier and a 1M context
2026-11-12 · Google released Gemini 4 Hydrogen (gemini-4-hydrogen) on November 12 as generally available on the Gemini API, on the free tier and at $1.50 per 1M input tokens and $7.50 per 1M output tokens on the paid tier.
Gemini 4 Hydrogen appears in Google Cloud's price list at $1.50 input and $7.50 output per 1M tokens, before Google has announced it
2026-11-12 · Google Cloud's public SKU list now carries Gemini 4 Hydrogen under two services, the Gemini API and Vertex AI, before Google has announced the model. @Mr_Salio flagged the rows at 08:11 UTC on November 12, and ArtificialWatch read them on Google's SKU list at 08:50 UTC.
GPT-6 Luna at a glance
- Developer
- OpenAI
- Status
- Live since September 22, 2026
- API price
- $0.10 input / $0.50 output per 1M tokens · OpenAI, gpt-6-luna
- Context window
- 1.05M tokens
Live — Sep 22, in the API and ChatGPT (Free and Go too) the same day · the cheap, high-volume tier · models.dev lists gpt-6-luna on OpenAI's own API (read Sep 24).
OpenAI opens the Decisions API: GPT-6 Luna returns probabilities, choices and scores for $0.10 per million input tokens
2026-10-06 · OpenAI has opened a public beta of the Decisions API, a new endpoint (POST /v1/decisions) where the model answers a question about your input with a number or a label instead of writing text. GPT-6 Luna is the only model it runs.
Gemini 4 Hydrogen vs GPT-6 Luna: quick answers
Which is better, Gemini 4 Hydrogen or GPT-6 Luna?
It depends on what you measure. Gemini 4 Hydrogen scores higher than GPT-6 Luna on all 4 public leaderboards that rate both. Gemini 4 Hydrogen's widest lead is on Vals AI. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 4 Hydrogen is at 81.9 and GPT-6 Luna at 26.7 (out of 100).
Which is newer, Gemini 4 Hydrogen or GPT-6 Luna?
Gemini 4 Hydrogen. It went live on November 12, 2026, 51 days after GPT-6 Luna (September 22, 2026).
Which is cheaper, Gemini 4 Hydrogen or GPT-6 Luna?
GPT-6 Luna is cheaper on both input and output. On each vendor's own API, Gemini 4 Hydrogen is $1.50 input / $7.50 output per million tokens and GPT-6 Luna is $0.10 input / $0.50 output per million tokens. GPT-6 Luna's rate rises for prompts over 272K tokens. Prices as published in the models.dev catalog, as of 2026-11-12.
Which has the bigger context window, Gemini 4 Hydrogen or GPT-6 Luna?
GPT-6 Luna, at 1.05M tokens against Gemini 4 Hydrogen's 1.05M, as each vendor lists it.
How do Gemini 4 Hydrogen and GPT-6 Luna compare for coding?
On the ArtificialWatch coding index, Gemini 4 Hydrogen is at 76 (#10 of 48) and GPT-6 Luna at 33.3 (#33). Gemini 4 Hydrogen scores higher on all 3 coding boards that rate both.
Who makes Gemini 4 Hydrogen and GPT-6 Luna?
Gemini 4 Hydrogen is from Google; GPT-6 Luna is from OpenAI.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed November 13, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · what a workload costs on each · the wire