text model comparison
Gemini 4 Argon vs GPT-5.6 Terra
Gemini 4 Argon and GPT-5.6 Terra are both current text models, from Google and OpenAI. Both cost $2 per 1M input tokens. On Arena Text, Gemini 4 Argon scores 1525 Elo and GPT-5.6 Terra 1466 Elo (Arena, measured October 8, 2026).
Data verified October 13, 2026 · Dataset 2026-10-13
Side by side
Standard-tier prices in effect today. The better value in each row is highlighted.
| Fact | Gemini 4 Argon | GPT-5.6 Terra |
|---|---|---|
| Price per 1M input tokens | $2 | $2 |
| Price per 1M output tokens | $10 (better) | $12 |
| Cost of 10M input and 2M output tokens | $40 (better) | $44 |
| Arena Text | 1525 Elo (#1 of 49) (better) | 1466 Elo (#27 of 49) |
| GPQA Diamond | Not measured | 93.3% (#13 of 40) |
| FrontierMath Tiers 1-3 (v2) | Not measured | 86% (#9 of 40) |
| SimpleQA Verified | Not measured | 43.2% (#25 of 36) |
| Provider | OpenAI | |
| Release date | September 30, 2026 | July 9, 2026 |
| Access | API only | API only |
| Context window | Not reported | 1,050,000 tokens |
| Max output | 1,000,000 tokens | 128,000 tokens |
| Input | text, image, video | text, image |
| Output | text | text |
When to choose each
Gemini 4 Argon
Best for
- Long-horizon coding and knowledge work once it reaches general API access
Watch out for
- Access is limited: Google is rolling it out first to cyber defenders in its Fairwind Program, and no Gemini API model id or pricing page entry exists yet
- The $2 input and $10 output rate is introductory with no end date; Google says $4 and $20 per 1M tokens applies afterwards
- Google has not published the context window
GPT-5.6 Terra
Best for
- Balanced long-context API evaluations
- Reasoning-heavy work that does not depend on broad factual recall
Watch out for
- Not in the pinned LiveBench snapshot; its independent scores here come from Epoch AI's own GPQA Diamond, FrontierMath and SimpleQA Verified runs
Gemini 4 Argon vs GPT-5.6 Terra FAQ
Which is cheaper, Gemini 4 Argon or GPT-5.6 Terra?
Both cost $2 per 1M input tokens. For 10M input and 2M output tokens, Gemini 4 Argon costs $40 and GPT-5.6 Terra $44 at standard rates.
Which scores higher on independent benchmarks, Gemini 4 Argon or GPT-5.6 Terra?
Gemini 4 Argon leads on Arena Text, 1525 Elo to 1466 Elo. Scores are independent evaluations, not either vendor's launch figures.
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- Claude Sonnet 5.5 vs GPT-5.6 Terra
- Claude Sonnet 5 vs Gemini 4 Argon
- Claude Sonnet 5 vs GPT-5.6 Terra
- Gemini 4 Argon vs GPT-4.1
- Gemini 4 Argon vs GPT-6.1 Sol
- Gemini 4 Argon vs GPT-6 Sol
Production evaluation
Choosing between Gemini 4 Argon and GPT-5.6 Terra?
Public benchmarks narrow the shortlist. We run both on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- A head-to-head evaluation on your real workload
- Routing between models by cost and difficulty