# Best LLM for Charts & Diagrams > Updated Oct 21, 2026 ยท evidence through Oct 21, 2026. Synthesized from cited community evidence and open benchmarks, not vendor marketing. Canonical page: https://modelmatchbook.com/best/vision-charts Gemini 3.8 Flash is the provisional first pick for Charts & Diagrams as of October 21, 2026, while independent task measurements are still limited. It ranks #2 of 75 on LMArena Vision's diagram category (Elo 1333), based on blind human preference for interpreting charts and diagrams. Claude Opus 5.5 scores within two points, so read the top two as close rather than as a measured gap. Claude Opus 5.5 is the next-ranked alternative. It ranks #4 of 75 on LMArena Vision's diagram category (Elo 1330), based on blind human preference for interpreting charts and diagrams. [1,2] ## 1. Gemini 3.8 Flash https://modelmatchbook.com/models/google/gemini-3.8-flash-20260902 Gemini 3.8 Flash ranks #2 of 75 on LMArena Vision's diagram category (Elo 1333), based on blind human preference for interpreting charts and diagrams. **Best when:** Its strongest result for this task is on LMArena Vision diagrams, which measures interpreting charts and diagrams. [1] ## 2. Claude Opus 5.5 https://modelmatchbook.com/models/anthropic/claude-opus-5.5-20260921 Claude Opus 5.5 ranks #4 of 75 on LMArena Vision's diagram category (Elo 1330), based on blind human preference for interpreting charts and diagrams. **Best when:** Its strongest result for this task is on LMArena Vision diagrams, which measures interpreting charts and diagrams. [2] ## 3. Claude Fable 5.1 https://modelmatchbook.com/models/anthropic/claude-fable-5.1-20260831 Ranks #7 on LMArena Vision's diagram category with Elo 1323 and #2 on document tasks, showing strength in structured visual content. **Best when:** Choose when your pipeline mixes diagrams with document analysis, as it scores 1513 on document arena tasks. [4,5] ## 4. Gemini 3.7 Flash https://modelmatchbook.com/models/google/gemini-3.7-flash-20260813 Ranks #4 on LMArena's general vision arena (Elo 1295) but falls to #11 on diagram-specific tasks (Elo 1320). **Best when:** Use for diverse image understanding beyond charts, as it holds the #4 position in the broader vision arena. [6] **Watch out for:** - Diagram performance (Elo 1320, rank #11) is notably weaker than its general vision ranking would suggest. [7,6] ## 5. GPT-6.1 Sol https://modelmatchbook.com/models/openai/gpt-6.1-sol-20260929 Ranks #5 on LMArena's vision arena (Elo 1294) but drops to #12 on diagram tasks (Elo 1319). **Best when:** Its strongest result for this task is on LMArena Vision, which measures reading images, screenshots, and documents. [8] **Watch out for:** - Diagram-specific ranking (#12) underperforms its general vision standing by 7 positions. [9,8] ## 6. Muse Spark 1.2 https://modelmatchbook.com/models/meta/muse-spark-1.2-20260805 Ties for #6 on LMArena's vision arena (Elo 1293) but falls to #15 on diagram tasks (Elo 1316). **Best when:** Its strongest result for this task is on LMArena Vision, which measures reading images, screenshots, and documents. [10] **Watch out for:** - 9-position drop on diagram tasks suggests weaker specialized chart interpretation relative to general vision. [11,10] ## 7. Claude Sonnet 5.5 https://modelmatchbook.com/models/anthropic/claude-sonnet-5.5-20260928 Ranks #9 on LMArena Vision's diagram category (Elo 1321) despite a weaker #28 showing in general vision (Elo 1265). **Best when:** Select for diagram-heavy workloads where its specialized ranking (#9) outweighs general vision limitations. [12] ## 8. GLM 5.3 Flash https://modelmatchbook.com/models/z-ai/glm-5.3-flash-20260826 GLM 5.3 Flash ranks #20 of 75 on LMArena Vision's diagram category (Elo 1306), based on blind human preference for interpreting charts and diagrams. **Best when:** Its strongest result for this task is on LMArena Vision diagrams, which measures interpreting charts and diagrams. [3] ## FAQ **What is the best model for Charts & Diagrams?** Gemini 3.8 Flash ranks first as of October 21, 2026. Gemini 3.8 Flash ranks #2 of 75 on LMArena Vision's diagram category (Elo 1333), based on blind human preference for interpreting charts and diagrams. [1] **What is the best alternative to Gemini 3.8 Flash?** Claude Opus 5.5 ranks second. Claude Opus 5.5 ranks #4 of 75 on LMArena Vision's diagram category (Elo 1330), based on blind human preference for interpreting charts and diagrams. [2] **Which open-weight model ranks highest for Charts & Diagrams?** GLM 5.3 Flash is the highest-ranked open-weight model, at #8. GLM 5.3 Flash ranks #20 of 75 on LMArena Vision's diagram category (Elo 1306), based on blind human preference for interpreting charts and diagrams. [3] ## Sources 1. "Within the 75 catalog models matched to this evaluation: Ranks #2 of 75 on LMArena Vision's diagram category (Elo 1333), based on blind human preference for interpreting charts and diagrams." (LMArena Vision diagrams, https://lmarena.ai/leaderboard) 2. "Within the 75 catalog models matched to this evaluation: Ranks #4 of 75 on LMArena Vision's diagram category (Elo 1330), based on blind human preference for interpreting charts and diagrams." (LMArena Vision diagrams, https://lmarena.ai/leaderboard) 3. "Within the 75 catalog models matched to this evaluation: Ranks #20 of 75 on LMArena Vision's diagram category (Elo 1306), based on blind human preference for interpreting charts and diagrams." (LMArena Vision diagrams, https://lmarena.ai/leaderboard) 4. "Within the 34 catalog models matched to this evaluation: Ranks #2 of 34 on LMArena's document arena (score 1513), based on blind preference for document tasks." (LMArena document arena, https://lmarena.ai/leaderboard) 5. "Within the 75 catalog models matched to this evaluation: Ranks #7 of 75 on LMArena Vision's diagram category (Elo 1323), based on blind human preference for interpreting charts and diagrams." (LMArena Vision diagrams, https://lmarena.ai/leaderboard) 6. "Within the 81 catalog models matched to this evaluation: Ranks #4 of 81 on LMArena's vision arena (Elo 1295), based on human preference on image-understanding tasks." (LMArena vision arena, https://lmarena.ai/leaderboard) 7. "Within the 75 catalog models matched to this evaluation: Ranks #11 of 75 on LMArena Vision's diagram category (Elo 1320), based on blind human preference for interpreting charts and diagrams." (LMArena Vision diagrams, https://lmarena.ai/leaderboard) 8. "Within the 81 catalog models matched to this evaluation: Ranks #5 of 81 on LMArena's vision arena (Elo 1294), based on human preference on image-understanding tasks." (LMArena vision arena, https://lmarena.ai/leaderboard) 9. "Within the 75 catalog models matched to this evaluation: Ranks #12 of 75 on LMArena Vision's diagram category (Elo 1319), based on blind human preference for interpreting charts and diagrams." (LMArena Vision diagrams, https://lmarena.ai/leaderboard) 10. "Within the 81 catalog models matched to this evaluation: Ranks #6 of 81 on LMArena's vision arena (Elo 1293), based on human preference on image-understanding tasks." (LMArena vision arena, https://lmarena.ai/leaderboard) 11. "Within the 75 catalog models matched to this evaluation: Ranks #15 of 75 on LMArena Vision's diagram category (Elo 1316), based on blind human preference for interpreting charts and diagrams." (LMArena Vision diagrams, https://lmarena.ai/leaderboard) 12. "Within the 75 catalog models matched to this evaluation: Ranks #9 of 75 on LMArena Vision's diagram category (Elo 1321), based on blind human preference for interpreting charts and diagrams." (LMArena Vision diagrams, https://lmarena.ai/leaderboard)