GPT-5.6 Terra vs Gemini 3.5 Flash: Release Comparison
Comparison of the GPT-5.6 Terra and Gemini 3.5 Flash releases: 6 and 3 models respectively, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across all 9 models.
- For intelligence, GPT-5.6 Terra scores highest: GPT-5.6 Terra (max) at 42, against Gemini 3.5 Flash (medium) at 34 for Gemini 3.5 Flash.
- For output speed, Gemini 3.5 Flash is fastest: Gemini 3.5 Flash (high) at 219 t/s, against GPT-5.6 Terra (max) at 100 t/s for GPT-5.6 Terra.
- For cost per task, GPT-5.6 Terra is cheapest: GPT-5.6 Terra (Non-reasoning) at $0.14, against Gemini 3.5 Flash (high) at $1.56 for Gemini 3.5 Flash.
Releases compared
Intelligence
Artificial Analysis Intelligence Index
Intelligence Index vs. Cost per Intelligence Index Task
Cost
Cost per Intelligence Index Task
Speed & Latency
Output Speed
Capability Scores
Capability Indices
Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2, AA-Briefcase, Humanity's Last Exam, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better
Incorporates 6 evaluations: AA-Omniscience, GDPval-AA v2, AA-Briefcase, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better
Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2, AA-Briefcase, Humanity's Last Exam, AA-LCR v1.1, GDP.pdf, AutomationBench-AA · Higher is better
Incorporates 6 evaluations: AA-Omniscience, GDPval-AA v2, AA-Briefcase, MLCR-AA, Humanity's Last Exam, AutomationBench-AA · Higher is better
Incorporates 6 evaluations: AA-Omniscience, Humanity's Last Exam, CritPt, GDPval-AA v2, AA-Briefcase, Terminal-Bench 4.0 · Higher is better
Incorporates 5 evaluations: AA-Omniscience, Humanity's Last Exam, GDPval-AA v2, AA-Briefcase, AA-LCR v1.1 · Higher is better
Further details
Input modality | Output modality | Weights | Provider Benchmarks | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GPT-5.6 Terra (max) |  OpenAI | 42 | 42 | 48 | 42 | 41 | 43 | 45 | $1.40 | $1.7 | $2.00 | $12.00 | $0.20 | $2,501 | 39k | 26k | 122M | 100 | 139.76s | 139.76s | 144.73s | 389.87s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - |  | |
| GPT-5.6 Terra (xhigh) | OpenAI | 38 | 40 | 44 | 40 | 38 | 38 | 44 | $0.63 | $1.7 | $2.00 | $12.00 | $0.20 | $1,187 | 20k | 12k | 52M | 96 | 15.48s | 15.48s | 20.68s | 221.04s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - |  | |
| GPT-5.6 Terra (high) | OpenAI | 34 | 38 | 40 | 37 | 34 | 35 | 42 | $0.34 | $1.7 | $2.00 | $12.00 | $0.20 | $768 | 11k | 5k | 33M | 92 | 3.02s | 3.02s | 8.44s | 121.17s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| Gemini 3.5 Flash (medium) |  Google | 34 | - | - | - | - | - | - | - | $1.3 | $1.50 | $9.00 | $0.15 | - | - | - | - | 214 | 13.39s | 13.39s | 15.73s | - | - | 1M | May 2026 | - | Yes | Supports: text, image, speech, and video | Supports: text | Not available | - | | |
| Gemini 3.5 Flash (high) | Google | 33 | 39 | 38 | 45 | 35 | 35 | 46 | $1.56 | $1.3 | $1.50 | $9.00 | $0.15 | $2,172 | 55k | 36k | 120M | 219 | 16.90s | 16.90s | 19.19s | 230.55s | - | 1M | May 2026 | - | Yes | Supports: text, image, speech, and video | Supports: text | Not available | - | | |
| GPT-5.6 Terra (medium) | OpenAI | 30 | 32 | 35 | 34 | 31 | 31 | 37 | $0.18 | $1.7 | $2.00 | $12.00 | $0.20 | $447 | 5k | 2k | 17M | 90 | 1.72s | 1.72s | 7.30s | 60.20s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| GPT-5.6 Terra (low) | OpenAI | 28 | 30 | 32 | 31 | 28 | 28 | 35 | $0.14 | $1.7 | $2.00 | $12.00 | $0.20 | $350 | 4k | 1k | 11M | 91 | 1.62s | 1.62s | 7.14s | 42.20s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| Gemini 3.5 Flash (minimal) | Google | 24 | - | - | - | - | - | - | - | $1.3 | $1.50 | $9.00 | $0.15 | - | - | - | - | 205 | 0.84s | 0.84s | 3.28s | - | - | 1M | May 2026 | - | No | Supports: text, image, speech, and video | Supports: text | Not available | - | | |
| GPT-5.6 Terra (Non-reasoning) | OpenAI | 21 | 22 | 24 | 23 | - | 21 | 24 | $0.14 | $1.7 | $2.00 | $12.00 | $0.20 | $256 | 3k | 0 | 6M | 93 | 0.87s | 0.87s | 6.27s | 33.70s | - | 1M | Jul 2026 | - | No | Supports: text and image | Supports: text | Not available | - | | |