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 | Claude Fable 5.1 Anthropic· reasoning | 165.0 | 1M | $10.0 | Closed | 1 Sep 2026 |
| 3 | Claude Opus 5 Anthropic· reasoning | 162.7 | 1M | $5.00 | Closed | 24 Jul 2026 |
| 4 | GPT-5.6 Sol OpenAI· reasoning | 162.0 | 1.05M | $2.00 | Closed | 9 Jul 2026 |
| 5 | GPT-5.6 Terra OpenAI· reasoning | 159.3 | 1.05M | $2.00 | Closed | 9 Jul 2026 |
| 6 | Gemini 3.7 Flash Google· reasoning | 157.7 | 1.05M | $0.75 | Closed | 13 Aug 2026 |
| 7 | Gemini 3.8 Flash Google· reasoning | 157.1 | 1.05M | $0.75 | Closed | 2 Sep 2026 |
| 8 | Muse Spark 1.3 Meta· reasoning | 156.9 | 1.05M | $1.25 | Closed | 2 Sep 2026 |
| 9 | Grok 4.6 xAI· reasoning | 156.5 | 500K | $2.00 | Closed | 12 Aug 2026 |
| 10 | Claude Sonnet 5 Anthropic· reasoning | 156.3 | 1M | $2.00 | Closed | 30 Jun 2026 |
| 11 | GPT-5.6 Luna OpenAI· reasoning | 156.3 | 1.05M | $0.20 | Closed | 9 Jul 2026 |
| 12 | Qwen3.8 Max (0902) Alibaba (Qwen)· reasoning | 155.3 | 1M | $2.00 | Closed | 1 Sep 2026 |
| 13 | Muse Spark 1.2 Meta· reasoning | 155.2 | 1.05M | $1.25 | Closed | 5 Aug 2026 |
| 14 | Gemini 3.6 Flash Google· reasoning | 154.4 | 1.05M | $0.75 | Closed | 21 Jul 2026 |
| 15 | Muse Spark 1.1 Meta· reasoning | 154.3 | 1.05M | $1.25 | Closed | 9 Jul 2026 |
| 16 | Grok 4.5 xAI· reasoning | 154.0 | 500K | $2.00 | Closed | 8 Jul 2026 |
| 17 | Gemini 3.5 Flash Lite Google· reasoning | 145.1 | 1.05M | $0.30 | Closed | 21 Jul 2026 |
| 18 | Qwen3.7 Flash Alibaba (Qwen)· reasoning | 144.6 | 1M | $0.030 | Closed | 27 Jul 2026 |