Best LLM for Long Documents & Large Context
Analyzing long documents, whole codebases or big transcripts needs a large context window — and once you're pushing hundreds of thousands of tokens per call, input price is the whole ballgame.
Best value pick
Qwen3.5 Flash
Alibaba · Overall Arena 1398 · about $18.70/month at 100,000 calls. The top-ranked Claude Opus 5 costs $2,000.00/month — you save $1,981.30/month with Qwen3.5 Flash.
| 1 | Qwen3.5 Flash | 1398 | $18.70 | Alibaba |
| 2 | GLM-5.3-Flash | 1472 | $23.75 | Z.ai (Zhipu AI) |
| 3 | Step 3.5 Flash | 1404 | $30.00 | StepFun |
| 4 | MiMo-V2.5 | 1427 | $35.00 | Xiaomi |
| 5 | MiMo-V2-Flash | 1394 | $35.00 | Xiaomi |
| 6 | MiMo-V2-Omni | 1422 | $35.00 | Xiaomi |
| 7 | DeepSeek V4 Flash | 1424 | $52.50 | DeepSeek |
| 8 | Google Gemma 3 27B Instruct (Bedrock)Est. | 1358 | $53.50 | AWS Bedrock |
| 9 | Hunyuan Hy3 | 1441 | $70.00 | Tencent |
| 10 | Qwen3 VL 235B A22B Instruct | 1421 | $74.00 | Alibaba |
| 11 | Llama 4 Maverick | 1360 | $75.50 | Meta |
| 12 | GPT-5.6 Luna | 1430 | $90.00 | OpenAI |
Intelligence scores are community Arena ratings from LMArena / arena.ai, used under CC BY 4.0. Snapshot last refreshed 18 September 2026. Scores are a relative signal, not an absolute measure of capability. A Measured score was voted on directly; an Estimated score is inherited from an identical base model (a regional/creator-prefixed hosting duplicate). See our methodology.
Why picking isn’t obvious
We require at least a 200K-token context window, then rank the qualifying models by overall Arena score and cost. A model that's slightly lower-ranked but far cheaper per 1M input tokens usually wins for document-heavy work.
FAQ
What is the best value LLM for long context?
Qwen3.5 Flash is the cheapest model that still clears our quality bar for this task, at about $18.70/month for 100,000 calls (1,500 in / 500 out). It scores 1398 on the Overall Arena.
Is the most expensive model worth it for this?
Claude Opus 5 tops the Overall Arena but costs about $2,000.00/month here — roughly $1,981.30/month more than Qwen3.5 Flash for 107 extra Arena points. For most workloads that gap is not worth the premium.
Cite / link to this page
You’re welcome to reference this page and its figures with attribution and a link back.
https://aicalculatorpro.com/best-llm-for/long-context-documents/<a href="https://aicalculatorpro.com/best-llm-for/long-context-documents/">Best LLM for Long Documents & Large Context — AI Calculator Pro</a>