Source: Epoch AI (CC BY 4.0). ECI is Epoch's item-response model over many benchmarks; each model page shows its 90% confidence interval.
Only models with both an ECI score and an OpenRouter price. Normalisation: 75% input + 25% output price. Click a point to open the model.
| # | Model | ECI ↓ | Context | In $/M | Weights | Released |
|---|---|---|---|---|---|---|
| 1 | GPT-6 Astra OpenAI· reasoning | 166.6 | 1.05M | $10.0 | Closed | 3 Sep 2026 |
| 2 | GPT-5.5 Pro OpenAI· reasoning | 162.4 | 1.05M | $30.0 | Closed | 23 Apr 2026 |
| 3 | GPT-5.6 Sol OpenAI· reasoning | 162.0 | 1.05M | $2.00 | Closed | 9 Jul 2026 |
| 4 | GPT-5.6 Terra OpenAI· reasoning | 159.3 | 1.05M | $2.00 | Closed | 9 Jul 2026 |
| 5 | GPT-5.5 OpenAI· reasoning | 159.3 | 1.05M | $5.00 | Closed | 23 Apr 2026 |
| 6 | GPT-5.4 Pro OpenAI· reasoning | 159.1 | 1.05M | $30.0 | Closed | 5 Mar 2026 |
| 7 | GPT-5.4 OpenAI· reasoning | 156.9 | 1.05M | $2.50 | Closed | 5 Mar 2026 |
| 8 | GPT-5.3-Codex OpenAI· reasoning | 156.8 | 400K | $1.75 | Closed | 5 Feb 2026 |
| 9 | GPT-5.6 Luna OpenAI· reasoning | 156.3 | 1.05M | $0.20 | Closed | 9 Jul 2026 |
| 10 | GPT-5.2 Pro OpenAI· reasoning | 155.4 | 400K | $21.0 | Closed | 11 Dec 2025 |
| 11 | GPT-5.2 OpenAI· reasoning | 153.4 | 400K | $1.75 | Closed | 11 Dec 2025 |
| 12 | GPT-5 Pro OpenAI· reasoning | 150.3 | 400K | $15.0 | Closed | 7 Oct 2025 |
| 13 | GPT-5 OpenAI· reasoning | 150.0 | 400K | $1.25 | Closed | 7 Aug 2025 |
| 14 | GPT-5.1 OpenAI· reasoning | 149.7 | 400K | $1.25 | Closed | 13 Nov 2025 |
| 15 | GPT-5.4 Mini OpenAI· reasoning | 148.8 | 400K | $0.75 | Closed | 17 Mar 2026 |
| 16 | o3 Pro OpenAI· reasoning | 147.4 | 200K | $20.0 | Closed | 10 Jun 2025 |
| 17 | o3 OpenAI· reasoning | 146.9 | 200K | $2.00 | Closed | 16 Apr 2025 |
| 18 | GPT-5.4 Nano OpenAI· reasoning | 145.8 | 400K | $0.20 | Closed | 17 Mar 2026 |
| 19 | o4 Mini OpenAI· reasoning | 145.6 | 200K | $1.10 | Closed | 16 Apr 2025 |
| 20 | GPT-5 Mini OpenAI· reasoning | 145.5 | 400K | $0.25 | Closed | 7 Aug 2025 |
| 21 | o1 OpenAI· reasoning | 141.9 | 200K | $15.0 | Closed | 17 Dec 2024 |
| 22 | GPT-5 Nano OpenAI· reasoning | 139.4 | 400K | $0.050 | Closed | 7 Aug 2025 |
| 23 | GPT-4.1 | 136.8 | 1.05M | $2.00 | Closed | 14 Apr 2025 |
| 24 | GPT-4.1 Mini | 135.0 | 1.05M | $0.40 | Closed | 14 Apr 2025 |
| 25 | GPT-4.1 Nano | 129.6 | 1.05M | $0.10 | Closed | 14 Apr 2025 |
| 26 | GPT-4o-mini | 126.6 | 128K | $0.15 | Closed | 18 Jul 2024 |