# Best LLM for a General Assistant > Updated Oct 20, 2026 ยท evidence through Oct 20, 2026. Synthesized from cited community evidence and open benchmarks, not vendor marketing. Canonical page: https://modelmatchbook.com/best/chat-assistant Gemini 4 Argon ranks first for a General Assistant as of October 20, 2026. Ranks #1 on LMArena's overall text arena (Elo 1524), instruction-following (Elo 1536), and factuality (Elo 1511), with 76% accuracy on SimpleQA Verified and 78.6% on FACTS Grounding. Gemini 3.8 Flash is the next-ranked alternative. It scores 81.41% on LiveBench Instruction Following (#1 of 59), including paraphrasing, simplifying, story generation, and summarization. [1,2,3,4,5,6] ## 1. Gemini 4 Argon https://modelmatchbook.com/models/google/gemini-4-argon-20261013 Ranks #1 on LMArena's overall text arena (Elo 1524), instruction-following (Elo 1536), and factuality (Elo 1511), with 76% accuracy on SimpleQA Verified and 78.6% on FACTS Grounding. **Best when:** Use for everyday factual queries where verified accuracy matters, as it leads SimpleQA Verified at 76% correct. [4] **More tips:** - Deploy when you need strong instruction adherence across diverse tasks, ranking #1 on LMArena's instruction-following category. [2] ## 2. Gemini 3.8 Flash https://modelmatchbook.com/models/google/gemini-3.8-flash-20260902 Gemini 3.8 Flash scores 81.41% on LiveBench Instruction Following (#1 of 59), including paraphrasing, simplifying, story generation, and summarization. **Best when:** Its strongest result for this task is on LiveBench Instruction Following, which measures following detailed instructions exactly. [6] ## 3. Claude Fable 5.1 https://modelmatchbook.com/models/anthropic/claude-fable-5.1-20260831 Claude Fable 5.1 ranks #3 of 111 on LMArena's factuality text view (Elo 1498), where answers are judged for factual accuracy in blind comparison. **Best when:** Its strongest result for this task is on LMArena factuality, which measures answering accurately when judged for facts. [7] ## 4. Muse Spark 1.3 https://modelmatchbook.com/models/meta/muse-spark-1.3-20260902 Muse Spark 1.3 scores 78% on LiveBench Instruction Following (#4 of 59), including paraphrasing, simplifying, story generation, and summarization. **Best when:** Its strongest result for this task is on LiveBench Instruction Following, which measures following detailed instructions exactly. [8] ## 5. Gemini 3.7 Flash https://modelmatchbook.com/models/google/gemini-3.7-flash-20260813 Gemini 3.7 Flash scores 79.93% on LiveBench Instruction Following (#2 of 59), including paraphrasing, simplifying, story generation, and summarization. **Best when:** Its strongest result for this task is on LiveBench Instruction Following, which measures following detailed instructions exactly. [9] ## 6. Claude Opus 5.5 https://modelmatchbook.com/models/anthropic/claude-opus-5.5-20260921 Claude Opus 5.5 ranks #1 of 152 on LMArena's instruction-following category (Elo 1536), based on blind human preference votes. **Best when:** Its strongest result for this task is on LMArena Instruction Following, which measures following instructions as people judge them. [10] ## 7. GPT-6 Astra https://modelmatchbook.com/models/openai/gpt-6-astra-20260903 GPT-6 Astra scores 92.65% on LiveBench Reasoning (#1 of 59), an objective, ground-truth-scored evaluation refreshed with new questions. **Best when:** Its strongest result for this task is on LiveBench Reasoning, which measures multi-step reasoning. [11] ## 8. GPT-6.1 Sol https://modelmatchbook.com/models/openai/gpt-6.1-sol-20260929 GPT-6.1 Sol scores 92.63% on LiveBench Reasoning (#2 of 59), an objective, ground-truth-scored evaluation refreshed with new questions. **Best when:** Its strongest result for this task is on LiveBench Reasoning, which measures multi-step reasoning. [12] ## FAQ **What is the best model for a General Assistant?** Gemini 4 Argon ranks first as of October 20, 2026. Ranks #1 on LMArena's overall text arena (Elo 1524), instruction-following (Elo 1536), and factuality (Elo 1511), with 76% accuracy on SimpleQA Verified and 78.6% on FACTS Grounding. [1,2,3,4,5] **What is the best alternative to Gemini 4 Argon?** Gemini 3.8 Flash ranks second. Gemini 3.8 Flash scores 81.41% on LiveBench Instruction Following (#1 of 59), including paraphrasing, simplifying, story generation, and summarization. [6] ## Sources 1. "Within the 152 catalog models matched to this evaluation: Ranks #1 of 152 on LMArena's overall text arena (Elo 1524), based on blind human preference votes." (LMArena text arena, https://lmarena.ai/leaderboard) 2. "Within the 152 catalog models matched to this evaluation: Ranks #1 of 152 on LMArena's instruction-following category (Elo 1536), based on blind human preference votes." (LMArena instruction-following category, https://lmarena.ai/leaderboard) 3. "Within the 111 catalog models matched to this evaluation: Ranks #1 of 111 on LMArena's factuality text view (Elo 1511), where answers are judged for factual accuracy in blind comparison." (LMArena text factuality, https://lmarena.ai/leaderboard) 4. "Within the 69 catalog models matched to this evaluation: Answers 76% of SimpleQA Verified correctly in Epoch AI's independent run (#1 of 69), short factual questions with a single verified answer." (SimpleQA Verified (Epoch AI), https://epoch.ai/benchmarks) 5. "Within the 44 catalog models matched to this evaluation: Scores 78.6% on FACTS Grounding (#6 of 44), measuring factual support against supplied source material." (FACTS Grounding, https://www.kaggle.com/benchmarks/google/facts-grounding) 6. "Within the 59 catalog models matched to this evaluation: Scores 81.41% on LiveBench Instruction Following (#1 of 59), including paraphrasing, simplifying, story generation, and summarization." (LiveBench Instruction Following, https://livebench.ai/) 7. "Within the 111 catalog models matched to this evaluation: Ranks #3 of 111 on LMArena's factuality text view (Elo 1498), where answers are judged for factual accuracy in blind comparison." (LMArena text factuality, https://lmarena.ai/leaderboard) 8. "Within the 59 catalog models matched to this evaluation: Scores 78% on LiveBench Instruction Following (#4 of 59), including paraphrasing, simplifying, story generation, and summarization." (LiveBench Instruction Following, https://livebench.ai/) 9. "Within the 59 catalog models matched to this evaluation: Scores 79.93% on LiveBench Instruction Following (#2 of 59), including paraphrasing, simplifying, story generation, and summarization." (LiveBench Instruction Following, https://livebench.ai/) 10. "Within the 152 catalog models matched to this evaluation: Ranks #1 of 152 on LMArena's instruction-following category (Elo 1536), based on blind human preference votes." (LMArena instruction-following category, https://lmarena.ai/leaderboard) 11. "Within the 59 catalog models matched to this evaluation: Scores 92.65% on LiveBench Reasoning (#1 of 59), an objective, ground-truth-scored evaluation refreshed with new questions." (LiveBench Reasoning, https://livebench.ai/) 12. "Within the 59 catalog models matched to this evaluation: Scores 92.63% on LiveBench Reasoning (#2 of 59), an objective, ground-truth-scored evaluation refreshed with new questions." (LiveBench Reasoning, https://livebench.ai/)