GPT-5.6 Terra vs gpt-oss-20b: Release Comparison
Comparison of the GPT-5.6 Terra and gpt-oss-20b releases: 6 and 2 models respectively, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across all 8 models.
- For intelligence, GPT-5.6 Terra scores highest: GPT-5.6 Terra (max) at 42, against gpt-oss-20b (low) at 10 for gpt-oss-20b.
- For output speed, gpt-oss-20b is fastest: gpt-oss-20b (low) at 216 t/s, against GPT-5.6 Terra (max) at 105 t/s for GPT-5.6 Terra.
- For cost per task, gpt-oss-20b is cheapest: gpt-oss-20b (high) at $0.01, against GPT-5.6 Terra (Non-reasoning) at $0.14 for GPT-5.6 Terra.
Releases compared
Intelligence
Artificial Analysis Intelligence Index
Intelligence Index vs. Cost per Intelligence Index Task
Cost per Task (USD, Log Scale)
Cost
Cost per Intelligence Index Task
Speed & Latency
Output Speed
Capability Scores
Capability Indexes
Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, Humanity's Last Exam, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better
Incorporates 6 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better
Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, Humanity's Last Exam, AA-LCR v1.1, GDP.pdf, AutomationBench-AA · Higher is better
Incorporates 6 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, MLCR-AA, Humanity's Last Exam, AutomationBench-AA · Higher is better
Incorporates 6 evaluations: AA-Omniscience, Humanity's Last Exam, CritPt, GDPval-AA v2.1, AA-Briefcase v1.1, Terminal-Bench 4.0 · Higher is better
Incorporates 5 evaluations: AA-Omniscience, Humanity's Last Exam, GDPval-AA v2.1, AA-Briefcase v1.1, AA-LCR v1.1 · Higher is better
Further details
Input modality | Output modality | Weights | Provider Benchmarks | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GPT-5.6 Terra (max) |  OpenAI | 42 | 41 | 47 | 41 | 40 | 43 | 45 | $1.40 | $1.7 | $2.00 | $12.00 | $0.20 | $2,501 | 39k | 26k | 122M | 105 | 223.75s | 223.75s | 228.53s | 366.50s | - | 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 | 94 | 18.40s | 18.40s | 23.74s | 214.98s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - |  | |
| GPT-5.6 Terra (high) | OpenAI | 34 | 37 | 40 | 37 | 34 | 34 | 42 | $0.34 | $1.7 | $2.00 | $12.00 | $0.20 | $768 | 11k | 5k | 33M | 88 | 3.03s | 3.03s | 8.70s | 129.24s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| GPT-5.6 Terra (medium) | OpenAI | 30 | 32 | 34 | 34 | 31 | 31 | 37 | $0.18 | $1.7 | $2.00 | $12.00 | $0.20 | $447 | 5k | 2k | 17M | 90 | 2.03s | 2.03s | 7.57s | 59.91s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| GPT-5.6 Terra (low) | OpenAI | 27 | 30 | 31 | 31 | 27 | 28 | 34 | $0.14 | $1.7 | $2.00 | $12.00 | $0.20 | $350 | 4k | 1k | 11M | 87 | 1.95s | 1.95s | 7.72s | 44.67s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| GPT-5.6 Terra (Non-reasoning) | OpenAI | 21 | 21 | 23 | 22 | - | 21 | 24 | $0.14 | $1.7 | $2.00 | $12.00 | $0.20 | $256 | 3k | 0 | 6M | 84 | 0.88s | 0.88s | 6.81s | 37.05s | - | 1M | Jul 2026 | - | No | Supports: text and image | Supports: text | Not available | - | | |
| gpt-oss-20b (low) | OpenAI | 10 | - | - | - | - | - | - | - | $0.1 | $0.07 | $0.20 | - | - | - | - | - | 216 | 0.93s | 10.18s | 12.49s | - | 21B 3.6B active at inference time | 131k | Aug 2025 | May 2025 | Yes | Supports: text | Supports: text |    +5 | |||
| gpt-oss-20b (high) | OpenAI | 9 | 7 | 5 | 7 | 7 | 12 | 11 | $0.01 | $0.1 | $0.06 | $0.19 | - | $29 | 18k | 16k | 70M | 170 | 0.83s | 12.57s | 15.51s | 102.10s | 21B 3.6B active at inference time | 131k | Aug 2025 | May 2024 | Yes | Supports: text | Supports: text |   +6 | |||