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 |
|---|---|---|---|---|---|---|
| 501 | Qwen3.6 Max Preview Alibaba (Qwen)· reasoning | — | 262K | $1.03 | ? | 27 Apr 2026 |
| 502 | Qwen 3.6 Flash (2026-04-16) | — | — | — | ? | 27 Apr 2026 |
| 503 | GPT-5.5 Pro (batch) OpenAI· reasoning | — | 1.05M | $15.0 | ? | 24 Apr 2026 |
| 504 | DeepSeek v4 Pro (unknown thinking) | — | — | — | Open source | 24 Apr 2026 |
| 505 | DeepSeek v4 Pro (high) | — | — | — | Open source | 24 Apr 2026 |
| 506 | DeepSeek v4 (unknown) | — | — | — | Open source | 24 Apr 2026 |
| 507 | DeepSeek v4 Flash (max) | — | — | — | Open source | 24 Apr 2026 |
| 508 | GPT-5.5 (no thinking) | — | — | — | Closed | 23 Apr 2026 |
| 509 | GPT-5.5 (low) | — | — | — | Closed | 23 Apr 2026 |
| 510 | GPT-5.5 Pro (xhigh) | — | — | — | Closed | 23 Apr 2026 |
| 511 | GPT-5.5 (xhigh) | — | — | — | Closed | 23 Apr 2026 |
| 512 | GPT-5.5 (medium) | — | — | — | Closed | 23 Apr 2026 |
| 513 | GPT-5.5 Pro (unknown thinking) | — | — | — | Closed | 23 Apr 2026 |
| 514 | GPT-5.5 (unknown thinking) | — | — | — | Closed | 23 Apr 2026 |
| 515 | MiMo-V2.5 Xiaomi· reasoning | — | 1.05M | $0.14 | Open source | 22 Apr 2026 |
| 516 | GPT-5.4 Image 2 OpenAI· reasoning | — | 272K | $8.00 | ? | 21 Apr 2026 |
| 517 | Claude Opus 4.7 (batch) Anthropic· reasoning | — | 1M | $2.50 | ? | 16 Apr 2026 |
| 518 | Claude Opus 4.7 (xhigh) | — | — | — | Closed | 16 Apr 2026 |
| 519 | Claude Opus 4.7 (low) | — | — | — | Closed | 16 Apr 2026 |
| 520 | Claude Opus 4.7 (no thinking) | — | — | — | Closed | 16 Apr 2026 |
| 521 | Claude Opus 4.7 (medium) | — | — | — | Closed | 16 Apr 2026 |
| 522 | Claude Opus 4.7 (unknown) | — | — | — | Closed | 16 Apr 2026 |
| 523 | Claude Mythos Preview (Early) | — | — | — | Closed | 7 Apr 2026 |
| 524 | SWE-1.6 | — | — | — | Closed | 7 Apr 2026 |
| 525 | Qwen3.6 Plus Alibaba (Qwen)· reasoning | — | 1M | $0.33 | ? | 2 Apr 2026 |
| 526 | GLM 5V Turbo Z.ai (Zhipu AI)· reasoning | — | 203K | $1.20 | ? | 1 Apr 2026 |
| 527 | Grok 4.20 Multi-Agent xAI· reasoning | — | 2M | $1.25 | ? | 31 Mar 2026 |
| 528 | Qwen 3.6 Plus (2026-04-02) | — | — | — | Closed | 31 Mar 2026 |
| 529 | Lyria 3 Pro Preview | — | 1.05M | $0 | ? | 30 Mar 2026 |
| 530 | Lyria 3 Clip Preview | — | 1.05M | $0 | ? | 30 Mar 2026 |
| 531 | Reka Edge Reka AI· reasoning | — | 16K | $0.10 | Open source | 20 Mar 2026 |
| 532 | GPT-5.4 mini (xhigh) | — | — | — | Closed | 17 Mar 2026 |
| 533 | GPT-5.4 mini (none) | — | — | — | Closed | 17 Mar 2026 |
| 534 | GPT-5.4 nano (no thinking) | — | — | — | Closed | 17 Mar 2026 |
| 535 | GPT-5.4 nano (low) | — | — | — | Closed | 17 Mar 2026 |
| 536 | GPT-5.4 mini (low) | — | — | — | Closed | 17 Mar 2026 |
| 537 | GPT-5.4 mini (medium) | — | — | — | Closed | 17 Mar 2026 |
| 538 | GPT-5.4 nano (medium) | — | — | — | Closed | 17 Mar 2026 |
| 539 | GPT-5.4 nano (xhigh) | — | — | — | Closed | 17 Mar 2026 |
| 540 | GPT-5.4 mini (unknown thinking) | — | — | — | Closed | 17 Mar 2026 |
| 541 | GLM 5 Turbo Z.ai (Zhipu AI)· reasoning | — | 203K | $1.20 | ? | 15 Mar 2026 |
| 542 | Seed-2.0-Lite ByteDance· reasoning | — | 262K | $0.25 | ? | 10 Mar 2026 |
| 543 | GPT-5.4 (batch) OpenAI· reasoning | — | 1.05M | $1.25 | ? | 5 Mar 2026 |
| 544 | GPT-5.4 Pro (batch) OpenAI· reasoning | — | 1.05M | $15.0 | ? | 5 Mar 2026 |
| 545 | GPT-5.4 (medium) | — | — | — | Closed | 5 Mar 2026 |
| 546 | GPT-5.4 (none) | — | — | — | Closed | 5 Mar 2026 |
| 547 | GPT-5.4 (low) | — | — | — | Closed | 5 Mar 2026 |
| 548 | GPT-5.4 Pro (xhigh) | — | — | — | Closed | 5 Mar 2026 |
| 549 | GPT-5.4 (xhigh) | — | — | — | Closed | 5 Mar 2026 |
| 550 | GPT-5.4 Pro (web) | — | — | — | Closed | 5 Mar 2026 |
| 551 | GPT-5.4 (unknown thinking) | — | — | — | Closed | 5 Mar 2026 |
| 552 | GPT-5.4 Pro (no thinking) | — | — | — | Closed | 5 Mar 2026 |
| 553 | Mercury 2 Inception Labs· reasoning | — | 128K | $0.25 | ? | 4 Mar 2026 |
| 554 | Seed-2.0-Mini ByteDance· reasoning | — | 262K | $0.10 | ? | 26 Feb 2026 |
| 555 | Nano Banana 2 (Gemini 3.1 Flash Image Preview) Google· reasoning | — | 66K | $0.50 | ? | 26 Feb 2026 |
| 556 | Qwen3.5-27B Alibaba (Qwen)· reasoning | — | 262K | $0.20 | Open source | 25 Feb 2026 |
| 557 | Qwen3.5-Flash Alibaba (Qwen)· reasoning | — | 1M | $0.065 | ? | 25 Feb 2026 |
| 558 | Gemini 3.1 Pro Preview Custom Tools Google· reasoning | — | 1.05M | $2.00 | ? | 25 Feb 2026 |
| 559 | Qwen3.5-4B | — | — | — | Open source | 24 Feb 2026 |
| 560 | Qwen3.5-2B | — | — | — | Open source | 24 Feb 2026 |
| 561 | Aion-2.0 AionLabs· reasoning | — | 131K | $0.80 | ? | 23 Feb 2026 |
| 562 | Claude Sonnet 4.6 (medium) | — | — | — | Closed | 17 Feb 2026 |
| 563 | Claude Sonnet 4.6 (32k thinking) | — | — | — | Closed | 17 Feb 2026 |
| 564 | Claude Sonnet 4.6 (16k thinking) | — | — | — | Closed | 17 Feb 2026 |
| 565 | Claude Sonnet 4.6 (no thinking) | — | — | — | Closed | 17 Feb 2026 |
| 566 | Claude Sonnet 4.6 (low) | — | — | — | Closed | 17 Feb 2026 |
| 567 | Claude Sonnet 4.6 (unknown thinking) | — | — | — | Closed | 17 Feb 2026 |
| 568 | Qwen3.5 Plus 2026-02-15 Alibaba (Qwen)· reasoning | — | 1M | $0.26 | ? | 16 Feb 2026 |
| 569 | Gemini 3 Deep Think | — | — | — | Closed | 12 Feb 2026 |
| 570 | Qwen3 Max Thinking Alibaba (Qwen)· reasoning | — | 262K | $0.78 | ? | 9 Feb 2026 |
| 571 | Claude Opus 4.6 (32k thinking) | — | — | — | Closed | 5 Feb 2026 |
| 572 | Claude Opus 4.6 (64k thinking) | — | — | — | Closed | 5 Feb 2026 |
| 573 | Claude Opus 4.6 (no thinking) | — | — | — | Closed | 5 Feb 2026 |
| 574 | Claude Opus 4.6 (120k thinking) | — | — | — | Closed | 5 Feb 2026 |
| 575 | Claude Opus 4.6 (low) | — | — | — | Closed | 5 Feb 2026 |
| 576 | Claude Opus 4.6 (unknown thinking) | — | — | — | Closed | 5 Feb 2026 |
| 577 | Claude Opus 4.6 (medium) | — | — | — | Closed | 5 Feb 2026 |
| 578 | GPT-5.3 Codex (xhigh) | — | — | — | Closed | 5 Feb 2026 |
| 579 | Claude Opus 4.6 (batch) Anthropic· reasoning | — | 1M | $2.50 | ? | 4 Feb 2026 |
| 580 | Step 3.5 Flash StepFun· reasoning | — | 262K | $0.10 | Open source | 29 Jan 2026 |
| 581 | Kimi K2.5 (Fireworks) | — | — | — | Open source | 27 Jan 2026 |
| 582 | MiniMax M2-her | — | 66K | $0.30 | ? | 23 Jan 2026 |
| 583 | Palmyra X5 | — | 1.04M | $0.60 | ? | 21 Jan 2026 |
| 584 | GPT Audio | — | 128K | $2.50 | ? | 19 Jan 2026 |
| 585 | GLM 4.7 Flash Z.ai (Zhipu AI)· reasoning | — | 200K | $0.060 | Open source | 19 Jan 2026 |
| 586 | GPT Audio Mini | — | 128K | $0.60 | ? | 19 Jan 2026 |
| 587 | GPT-5.2-Codex OpenAI· reasoning | — | 400K | $1.75 | ? | 14 Jan 2026 |
| 588 | MiniMax M2.1 MiniMax· reasoning | — | 205K | $0.30 | Open source | 23 Dec 2025 |
| 589 | Seed 1.6 ByteDance· reasoning | — | 262K | $0.25 | ? | 23 Dec 2025 |
| 590 | Seed 1.6 Flash ByteDance· reasoning | — | 262K | $0.075 | ? | 23 Dec 2025 |
| 591 | GLM-4.7 (Together) | — | — | — | Open source | 22 Dec 2025 |
| 592 | GLM-4.7 (Novita) | — | — | — | Open source | 22 Dec 2025 |
| 593 | Gemini 3 Flash Preview Google· reasoning | — | 1.05M | $0.50 | ? | 17 Dec 2025 |
| 594 | Gemini 3 Flash Preview (batch) Google· reasoning | — | 1.05M | $0.25 | ? | 17 Dec 2025 |
| 595 | GPT-5.2 (none) | — | — | — | Closed | 11 Dec 2025 |
| 596 | GPT-5.2 (xhigh) | — | — | — | Closed | 11 Dec 2025 |
| 597 | GPT-5.2 (medium) | — | — | — | Closed | 11 Dec 2025 |
| 598 | GPT-5.2 (low) | — | — | — | Closed | 11 Dec 2025 |
| 599 | GPT-5.2 Pro (web) | — | — | — | Closed | 11 Dec 2025 |
| 600 | GPT-5.2 (unknown thinking) | — | — | — | Closed | 11 Dec 2025 |