GPT-5.6 Luna vs gpt-oss-20b: Release Comparison
Comparison of the GPT-5.6 Luna 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 Luna scores highest: GPT-5.6 Luna (max) at 37, against gpt-oss-20b (low) at 10 for gpt-oss-20b.
- For output speed, gpt-oss-20b is fastest: gpt-oss-20b (low) at 224 t/s, against GPT-5.6 Luna (max) at 144 t/s for GPT-5.6 Luna.
- For cost per task, GPT-5.6 Luna and gpt-oss-20b tie at $0.01 (GPT-5.6 Luna (low) and gpt-oss-20b (high)).
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 Luna (max) |  OpenAI | 37 | 40 | 44 | 37 | 36 | 36 | 43 | $0.18 | $0.2 | $0.20 | $1.20 | $0.02 | $320 | 41k | 28k | 154M | 144 | 115.79s | 115.79s | 119.26s | 284.02s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - |  | |
| GPT-5.6 Luna (xhigh) | OpenAI | 35 | 37 | 41 | 35 | 33 | 34 | 41 | $0.09 | $0.2 | $0.20 | $1.20 | $0.02 | $179 | 24k | 15k | 85M | 136 | 40.24s | 40.24s | 43.92s | 172.71s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - |  | |
| GPT-5.6 Luna (high) | OpenAI | 32 | 34 | 37 | 33 | 30 | 32 | 38 | $0.04 | $0.2 | $0.20 | $1.20 | $0.02 | $108 | 14k | 7k | 50M | 130 | 15.15s | 15.15s | 18.99s | 102.88s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| GPT-5.6 Luna (medium) | OpenAI | 25 | 27 | 28 | 28 | 24 | 26 | 32 | $0.02 | $0.2 | $0.20 | $1.20 | $0.02 | $44 | 4k | 2k | 18M | 129 | 2.61s | 2.61s | 6.47s | 34.15s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| GPT-5.6 Luna (low) | OpenAI | 21 | 23 | 22 | 24 | 20 | 23 | 28 | $0.01 | $0.2 | $0.20 | $1.20 | $0.02 | $27 | 3k | 559 | 10M | 131 | 1.69s | 1.69s | 5.52s | 19.27s | - | 1M | Jul 2026 | - | Yes | Supports: text and image | Supports: text | Not available | - | | |
| GPT-5.6 Luna (Non-reasoning) | OpenAI | 16 | 16 | 15 | 17 | - | 18 | 22 | $0.01 | $0.2 | $0.20 | $1.20 | $0.02 | $23 | 2k | 0 | 5M | 138 | 0.81s | 0.81s | 4.44s | 14.69s | - | 1M | Jul 2026 | - | No | Supports: text and image | Supports: text | Not available | - | | |
| gpt-oss-20b (low) | OpenAI | 10 | - | - | - | - | - | - | - | $0.1 | $0.07 | $0.215 | - | - | - | - | - | 224 | 0.92s | 9.85s | 12.08s | - | 21B 3.6B active at inference time | 131k | Aug 2025 | May 2025 | Yes | Supports: text | Supports: text |    +4 | |||
| gpt-oss-20b (high) | OpenAI | 9 | 7 | 5 | 7 | 7 | 12 | 11 | $0.01 | $0.1 | $0.07 | $0.18 | - | $31 | 18k | 16k | 70M | 186 | 0.85s | 11.63s | 14.32s | 104.61s | 21B 3.6B active at inference time | 131k | Aug 2025 | May 2024 | Yes | Supports: text | Supports: text |  +5 | |||