The week on the leaderboard, 14 Sept 2026 to 20 Sept 2026

The week of 14 Sept 2026 to 20 Sept 2026, from 7 daily updates.

Three things that happened

• Biggest riser: DeepSeek V4 Flash, up 10.0 points to 62.0 on the BenchLeader Index as new results landed.
• 13 new models arrived: Step 5 Preview, GLM 5.3 FlashX, Union Alpha, Jamba Large, Jamba Mini and more.
• Busiest benchmark: CritPt with 436 new results; 6954 new results were published in all.

Index movers

• DeepSeek V4 Flash+10.0
• GPT-5.4 Mini+8.8
• GLM 4.5V+8.6
• Qwen3.8 27B+8.1
• Grok 4.1+8.1
• Grok 4 Fast+7.8
• Grok 4.5+7.7
• Muse Spark 1.3+7.1

| Model | Provider | 14 Sept 2026 | 20 Sept 2026 | Change | |---|---|---:|---:|---:| | DeepSeek V4 Flash | DeepSeek | 52.0 | 62.0 | +10.0 | | GPT-5.4 Mini | OpenAI | 46.9 | 55.7 | +8.8 | | GLM 4.5V | Zhipu AI | 43.0 | 51.6 | +8.6 | | Qwen3.8 27B | Alibaba | 51.1 | 59.2 | +8.1 | | Grok 4.1 | xAI | 48.9 | 57.0 | +8.1 | | Grok 4 Fast | xAI | 46.5 | 54.3 | +7.8 | | Grok 4.5 | xAI | 53.3 | 61.0 | +7.7 | | Muse Spark 1.3 | Meta | 62.3 | 69.4 | +7.1 | | DeepSeek V4 Pro | DeepSeek | 57.2 | 64.2 | +7.0 | | Qwen3 14B | Alibaba | 40.9 | 47.8 | +6.9 |

New models

• Step 5 Preview (StepFun) appeared with 5 benchmark results, entering the BenchLeader Index at #39. (details)
• GLM 5.3 FlashX (Zhipu AI) is now listed at $0.59/M blended; no independent results yet. (details)
• Union Alpha (Unknown) appeared with 1 benchmark result. (details)
• Jamba Large (AI21 Labs) is now listed at $3.50/M blended; no independent results yet. (details)
• Jamba Mini (AI21 Labs) is now listed at $0.25/M blended; no independent results yet. (details)
• Qwen3 8 (Alibaba) appeared with 4 benchmark results. (details)
• Solar Pro 4 (Upstage) appeared with 1 benchmark result. (details)
• Palmyra X4 (Writer) is now listed at $4.38/M blended; no independent results yet. (details)
• Mercury 2.5 (high) (Inception) appeared with 3 benchmark results. (details)
• K2 Horizon 0.9B (MBZUAI) appeared with 3 benchmark results. (details)
• K2 Horizon 3.7B (MBZUAI) appeared with 3 benchmark results. (details)
• K2 Horizon 7B (MBZUAI) appeared with 3 benchmark results. (details)
• K2 Horizon MoVA 36B A4B (MBZUAI) appeared with 3 benchmark results. (details)

Price changes

• Nemotron Nano 12B v2 VL input price moved from $0.20/M to $0.00/M (100% down).
• Qwen-VL OCR input price moved from $0.72/M to $0.04/M (94% down).
• Deepseek v4 Flash Vision input price moved from $0.44/M to $0.15/M (66% down).
• Qwen3 Coder Plus output price moved from $5.00/M to $2.30/M (54% down).
• Qwen3.5 Plus (thinking) output price moved from $3.44/M to $1.72/M (50% down).
• Qwen3.5 Flash output price moved from $1.72/M to $1.03/M (40% down).
• Qwen3.5-9B (no reasoning) input price moved from $0.14/M to $0.10/M (29% down).
• MiniMax-M1 input price moved from $0.55/M to $0.40/M (27% down).
• Muse Glimmer 30B output price moved from $1.50/M to $1.10/M (27% down).
• Muse Glimmer output price moved from $1.50/M to $1.20/M (20% down).
• Qwen3 Coder Next output price moved from $1.50/M to $1.20/M (20% down).
• Qwen3.8 27B (xhigh) input price moved from $0.50/M to $0.40/M (20% down).
• gpt-oss-20b (high) input price moved from $0.06/M to $0.05/M (17% down).
• Llama 4 Maverick input price moved from $0.26/M to $0.24/M (8% down).
• Gemma 4 26B A4B input price moved from $0.13/M to $0.12/M (8% down).

Top five as of 20 Sept 2026

1. Claude Fable 5.1 — 72.0
2. GPT-6 Astra — 71.9
3. GPT-6 Astra — 71.8
4. Claude Fable 5.1 — 71.6
5. Claude Fable 5.1 — 71.3

Generated from the week's daily updates; every line links to the page where the numbers and their sources can be checked.