Model intelligence
31 AI models
Capability (Epoch Capabilities Index and individual benchmarks from Epoch AI), API list prices and context windows (OpenRouter), release dates and open-weight status. Benchmarks are shown individually - never merged into one invented score.
Epoch Capabilities Index by release date
Capability frontier
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.
Blended $/1M tokens (3:1 input:output) vs ECI
Price vs capability
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 | Claude Fable 5.1 Anthropic· reasoning | 165.0 | 1M | $10.0 | Closed | 1 Sep 2026 |
| 2 | Claude Fable 5 Anthropic· reasoning | 163.6 | 1M | $10.0 | Closed | 9 Jun 2026 |
| 3 | Claude Opus 5 Anthropic· reasoning | 162.7 | 1M | $5.00 | Closed | 24 Jul 2026 |
| 4 | Claude Opus 4.8 Anthropic· reasoning | 158.3 | 1M | $5.00 | Closed | 28 May 2026 |
| 5 | Claude Opus 4.7 Anthropic· reasoning | 156.4 | 1M | $5.00 | Closed | 16 Apr 2026 |
| 6 | Claude Sonnet 5 Anthropic· reasoning | 156.3 | 1M | $2.00 | Closed | 30 Jun 2026 |
| 7 | Claude Opus 4.6 Anthropic· reasoning | 155.4 | 1M | $5.00 | Closed | 5 Feb 2026 |
| 8 | Claude Sonnet 4.6 Anthropic· reasoning | 152.3 | 1M | $3.00 | Closed | 17 Feb 2026 |
| 9 | Claude Opus 4.5 Anthropic· reasoning | 150.1 | 200K | $5.00 | Closed | 24 Nov 2025 |
| 10 | Claude Sonnet 4.5 Anthropic· reasoning | 146.8 | 1M | $3.00 | Closed | 29 Sep 2025 |
| 11 | Claude Opus 4.1 Anthropic· reasoning | 144.1 | 200K | $15.0 | Closed | 5 Aug 2025 |
| 12 | Claude Opus 4 | 142.7 | — | — | Closed | 22 May 2025 |
| 13 | Claude Haiku 4.5 Anthropic· reasoning | 142.4 | 200K | $1.00 | Closed | 15 Oct 2025 |
| 14 | Claude Sonnet 4 Anthropic· reasoning | 141.7 | 200K | $3.00 | Closed | 22 May 2025 |
| 15 | Claude 3.7 Sonnet | 141.2 | — | — | Closed | 24 Feb 2025 |
| 16 | Claude 3.5 Sonnet (October 2024) | 133.6 | — | — | Closed | 22 Oct 2024 |
| 17 | Claude 3.5 Sonnet | 130.0 | — | — | Closed | 20 Jun 2024 |
| 18 | Claude 3.5 Haiku | 127.2 | — | — | Closed | 22 Oct 2024 |
| 19 | Claude 3 Opus | 126.9 | — | — | Closed | 29 Feb 2024 |
| 20 | Claude 3 Sonnet | 120.7 | — | — | Closed | 29 Feb 2024 |
| 21 | Claude Instant | 120.2 | — | — | Closed | 9 Aug 2023 |
| 22 | Claude 2 | 120.1 | — | — | Closed | 11 Jul 2023 |
| 23 | Claude 2.1 | 119.2 | — | — | Closed | 21 Nov 2023 |
| 24 | Claude 3 Haiku | 118.3 | — | — | Closed | 7 Mar 2024 |
| 25 | Claude Opus 5.5 Anthropic· reasoning | — | 1M | $4.00 | ? | 22 Sep 2026 |
| 26 | Claude Sonnet 5.5 Anthropic· reasoning | — | 1M | $2.00 | ? | 28 Sep 2026 |
| 27 | Claude Mythos Preview (Early) | — | — | — | Closed | 7 Apr 2026 |
| 28 | Claude 3.5 Haiku (Oct 2024) | — | — | — | Closed | 22 Oct 2024 |
| 29 | Claude 3.5 Sonnet (Oct 2024) | — | — | — | Closed | 22 Oct 2024 |
| 30 | Claude 3.5 Sonnet (Jun 2024) | — | — | — | Closed | 20 Jun 2024 |
| 31 | Claude 1.3 | — | — | — | Closed | 18 Apr 2023 |
Showing 31 of 31. Benchmark cells are % (best reported setting). 3.8K benchmark results in total.Export CSV