Recommendation for Long documents
Document Summarization
Our top recommendation for Document Summarization, based on the public evidence we track, is SpaceXAI: Grok 4.6.[1][2][3] Consider for long-query tasks where you have fallback verification, given its #26 ranking on the category. Watch out: Watch for retrieval failures on document tasks: one logged run showed 0 citations versus 57 in the target, and year mismatches (2026 vs 2022) in fetched results. Google: Gemini 3.7 Flash is the next-ranked alternative. Choose when processing long articles or transcripts where prompt length is a constraint, as it scores #5 on long-query preference.
About this recommendation
- Updated
- Sep 4, 2026
- Evidence through
- Sep 4, 2026
- Sources
- 8
- Revision
- v55
Decision audit
Why this result
Inspect the inputs and the computed order behind the recommendation.
Models screened
20
live candidates
Evaluation feeds
6
task-weighted
Winner coverage
38%
intended feed weight
Largest provider share
2 of 7
Anthropic
Sources evaluated
The task sets these weights before any model is scored.
| Evaluation feed | Weight | Winner result | Field measured |
|---|---|---|---|
| FACTS Groundingunavailable | 25% | feed unavailable | 0/20 |
| LiveBench Instruction Following | 20% | #15 | 16/20 |
| LMArena Document | 20% | not measured | 7/20 |
| LongBench v2unavailable | 15% | feed unavailable | 0/20 |
| LMArena Long Query | 10% | #24 | 18/20 |
| OpenRouter usage | 10% | 91/100 | 20/20 |
Provider concentration
Each exact model is scored separately; provider identity is not a ranking input.
- Anthropic2 models
- Google1 model
- Meta1 model
- OpenAI1 model
- xAI1 model
- xiaomi1 model
Decision table
Every published model is shown in computed order. Practitioner sources are distinct community threads, not the citations repeated in the prose below.
| Rank | Model | Relative score | Coverage | Practitioner evidence | Strongest measured reason |
|---|---|---|---|---|---|
| 01 | Grok 4.6xAI | 58 | 38% | 1 threads · 1 families · 0 cautions | #15 LiveBench Instruction Following · #24 LMArena Long Query |
| 02 | Gemini 3.7 FlashGoogle | 57 | 38% | no linked practitioner threads | #2 LiveBench Instruction Following · #5 LMArena Long Query |
| 03 | Claude Fable 5Anthropic | 55 | 43% | no linked practitioner threads | #3 LMArena Document · #3 LMArena Long Query |
| 04 | GPT-5.6 SolOpenAI | 52 | 43% | no linked practitioner threads | #6 LMArena Document · #16 LiveBench Instruction Following |
| 05 | Muse Spark 1.2Meta | 50 | 38% | no linked practitioner threads | #8 LiveBench Instruction Following · #9 LMArena Long Query |
| 06 | MiMo-V2.5-Proxiaomi | 50 | 28% | no linked practitioner threads | #13 LMArena Long Query |
| 07 | Claude Opus 4.6Anthropic | 49 | 43% | no linked practitioner threads | #1 LMArena Long Query · #2 LMArena Document |
Relative score combines normalized benchmark quality and signal coverage; independent practitioner evidence and freshness are bounded tie-breakers. It is an ordering score, not an absolute quality percentage. The writing model receives this order and cannot change it.
Grok 4.6 ranks #26 on LMArena's long-query category, with community evidence showing mixed behavior on document retrieval tasks.
Best when: Consider for long-query tasks where you have fallback verification, given its #26 ranking on the category.
Tips
- Consider for long-query tasks where you have fallback verification, given its #26 ranking on the category.
Watch out for
- Watch for retrieval failures on document tasks: one logged run showed 0 citations versus 57 in the target, and year mismatches (2026 vs 2022) in fetched results.
Gemini 3.7 Flash ranks #5 on LMArena's long-query category, showing solid handling of extended prompts.
Best when: Choose when processing long articles or transcripts where prompt length is a constraint, as it scores #5 on long-query preference.
Tips
- Choose when processing long articles or transcripts where prompt length is a constraint, as it scores #5 on long-query preference.
Claude Fable 5 holds #3 on LMArena's document arena, demonstrating reliable performance on document tasks.
Best when: Deploy for document summarization workflows where benchmark preference data matters, given its #3 position on the document arena.
Tips
- Deploy for document summarization workflows where benchmark preference data matters, given its #3 position on the document arena.
GPT-5.6 Sol places #8 on LMArena's document arena, indicating moderate preference for its document outputs.
Best when: Consider for document summarization if you need broad deployment route availability, with #8 benchmark standing as a reference point.
Tips
- Consider for document summarization if you need broad deployment route availability, with #8 benchmark standing as a reference point.
Muse Spark 1.2 achieves #9 on LMArena's long-query category, showing competitive handling of extended prompts.
Best when: Select for long-form summarization where prompt length exceeds typical limits, based on its #9 long-query ranking.
Tips
- Select for long-form summarization where prompt length exceeds typical limits, based on its #9 long-query ranking.
MiMo-V2.5-Pro ranks #15 on LMArena's long-query category as an open-weight option with measurable long-context performance.
Best when: Pick this open-weight model when you need local or self-hosted deployment for long documents, with #15 long-query standing.
Tips
- Pick this open-weight model when you need local or self-hosted deployment for long documents, with #15 long-query standing.
Claude Opus 4.6 sits at #2 on LMArena's document arena, indicating strong human preference for document tasks.
Best when: Use for document summarization where human evaluators preferred its output, as shown by its #2 ranking on the document-specific benchmark.
Tips
- Use for document summarization where human evaluators preferred its output, as shown by its #2 ranking on the document-specific benchmark.
Frequently asked
- What is the top-ranked model for Document Summarization?
- SpaceXAI: Grok 4.6 ranks first in the current evidence-weighted comparison. Consider for long-query tasks where you have fallback verification, given its #26 ranking on the category.[1]
- What should I watch out for with SpaceXAI: Grok 4.6?
- Watch for retrieval failures on document tasks: one logged run showed 0 citations versus 57 in the target, and year mismatches (2026 vs 2022) in fetched results.[2]
- What is an alternative to SpaceXAI: Grok 4.6?
- Google: Gemini 3.7 Flash is the next-ranked option. Choose when processing long articles or transcripts where prompt length is a constraint, as it scores #5 on long-query preference.[3]
Sources
- 1
“Ranks #26 of 144 on LMArena's long-query category (Elo 1467), based on blind human preference for longer prompts.”
LMArena long-query category · Benchmark · Sep 1, 2026 - 2
“Ready to implement. #84’s measurement questions are answered by four Grok 4.6 local runs (21 Aug 2026, `papers` CLI on). | Draft | Stop reason | Via papers | Logged as “OA but no text” | Read vs rest | |---|---|---|---|---| | substances | target of 5 | 5 | 6 (all `queued_ckn`) | year 2021=2021; cites 42 vs 59 | | psych-ed-management | target of 5 | 5 | 1 (`queued_ckn`) | **year 2026 vs 2022; cites 0 vs 57** | | organic | target of 5 | 5 fetched, 4 cited | 2 (`queued_ckn` / retry) | year 2026 vs…”
bartholomewtj · GitHub · Aug 21, 2026 - 3
“Ranks #5 of 144 on LMArena's long-query category (Elo 1493), based on blind human preference for longer prompts.”
LMArena long-query category · Benchmark · Sep 1, 2026 - 4
“Ranks #3 of 29 on LMArena's document arena (score 1504), based on blind preference for document tasks.”
LMArena document arena · Benchmark · Jul 30, 2026 - 5
“Ranks #8 of 29 on LMArena's document arena (score 1479), based on blind preference for document tasks.”
LMArena document arena · Benchmark · Jul 30, 2026 - 6
“Ranks #9 of 144 on LMArena's long-query category (Elo 1486), based on blind human preference for longer prompts.”
LMArena long-query category · Benchmark · Sep 1, 2026 - 7
“Ranks #15 of 144 on LMArena's long-query category (Elo 1482), based on blind human preference for longer prompts.”
LMArena long-query category · Benchmark · Sep 1, 2026 - 8
“Ranks #2 of 29 on LMArena's document arena (score 1510), based on blind preference for document tasks.”
LMArena document arena · Benchmark · Jul 30, 2026
Rankings synthesized from community evidence and open benchmarks. See methodology. Not driven by vendor marketing.