Who ranks #1 on the Lech Mazur Writing leaderboard?
As of August 20, 2026, GPT-5 by OpenAI ranks #1 on Lech Mazur Writing at 8.6%. API pricing is $1.25/M input and $10.00/M output.
As of August 20, 2026, GPT-5 is #1 for Lech Mazur Writing at 8.6%. Ranked by the Lech Mazur writing eval, which scores prose quality instead of multiple-choice knowledge. 27 models in this index have a published Lech Mazur Writing score. Lech Mazur Writing leaderboard: rank models by Lech Mazur Writing next to live API token prices.
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As of August 20, 2026, GPT-5 by OpenAI is #1 for Lech Mazur Writing at 8.6%. Ranked by the Lech Mazur writing eval, which scores prose quality instead of multiple-choice knowledge. This board also tracks Lech Mazur Writing. Next on the same board: Kimi K2 Instruct and Claude Opus 4.1. This lech mazur writing leaderboard ranks models by Lech Mazur Writing. Scores come from public evals. Prices are the live API rates in the table above.
Sources: OpenAI API pricing (https://developers.openai.com/api/docs/pricing); Anthropic Claude API pricing (https://platform.claude.com/docs/en/about-claude/pricing); Gemini API pricing (https://ai.google.dev/gemini-api/docs/pricing)
| Rank | Model | Lech Mazur Writing | Input /M | Output /M |
|---|---|---|---|---|
| 1 | GPT-5 | 8.6% | $1.25 | $10.00 |
| 2 | Kimi K2 Instruct | 8.6% | $0.50 | $0.50 |
| 3 | Claude Opus 4.1 | 8.5% | $15.00 | $75.00 |
| 4 | o3-pro | 8.4% | $20.00 | $80.00 |
| 5 | o3 | 8.4% | $2.00 | $8.00 |
| 6 | Gemini 2.5 Pro | 8.4% | $1.25 | $10.00 |
| 7 | Claude Opus 4 | 8.4% | $15.00 | $75.00 |
| 8 | GPT-5 mini | 8.3% | $0.25 | $2.00 |
Rank one eval at a time. All LLM benchmarks.
As of August 20, 2026, GPT-5 by OpenAI ranks #1 on Lech Mazur Writing at 8.6%. API pricing is $1.25/M input and $10.00/M output.
The current Lech Mazur Writing ranking as of August 20, 2026 is 1. GPT-5 at 8.6%; 2. Kimi K2 Instruct at 8.6%; 3. Claude Opus 4.1 at 8.5%.
Qwen3 235B A22B is the cheapest scored model on this lech mazur writing leaderboard at $0.10/M input and $0.10/M output ($0.20 blended). GPT-5 still leads Lech Mazur Writing at 8.6%.
Not automatically. GPT-5 leads Lech Mazur Writing, but a cheaper scored model can be the better production choice if the quality gap is small. Use the table to weigh Lech Mazur Writing against input/output price, context window, and related evals.
Scores and API prices on this page are refreshed from published evals and provider rates. The snapshot is labeled August 20, 2026. Treat it as a current index, not a one-off blog post.
Lech Mazur Writing is a public LLM eval (the Lech Mazur writing eval, which scores prose quality instead of multiple-choice knowledge.). This page ranks models that have published a score, next to live API prices.
This page is the Lech Mazur Writing leaderboard. Models are sorted by Lech Mazur Writing, with input and output token prices on the same row so you can weigh score against cost. Official boards often omit price; that comparison is the point of this index.
Official eval pages own the methodology. This page keeps the published Lech Mazur Writing score next to live API $/M so you can pick a production SKU, not only a trophy number.