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LongCat-Flash-Thinking-2601 vs Solar Pro 4

LongCat-Flash-Thinking-2601 and Solar Pro 4 are closely matched at 35.3 and 35.1 on the LLM Stats Score. LongCat-Flash-Thinking-2601 and Solar Pro 4 cost the same.

Meituan · Upstage · Updated for 2026

Which is better?

LongCat-Flash-Thinking-2601 and Solar Pro 4 are closely matched on the overall LLM Stats Score at 35.3 and 35.1.

In the 4 individual benchmarks reported for both models, Solar Pro 4 wins 3; this is a narrower head-to-head signal than the composite indexes.

Solar Pro 4 also accepts a larger context window (524,288 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose LongCat-Flash-Thinking-2601

  • you need open weights you can self-host or fine-tune

Choose Solar Pro 4

  • you value its reported benchmark strengths — it wins 3 of 4 exact shared results
  • you process long inputs — it offers a 524,288 token context window
  • you want the most recent training data — it shipped Aug 2026

At a glance

The differences that matter most.

LongCat-Flash-Thinking-2601
Meituan
Solar Pro 4
Upstage
Core performance indexes
LLM Stats Score
35.3
#92
35.1
#94
Reasoning
35.5
#85
34.8
#89
Coding
18.8
#114
21.0
#96
Agents
9.6
#127
11.5
#113
Cost, coverage & limits
Benchmark wins
1 of 4
3 of 4
Input price
$0.30 / M
$0.30 / M
Output price
$1.20 / M
$1.20 / M
Context window
128,000
524,288

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
LongCat-Flash-Thinking-2601
Solar Pro 4
Math
30.5#75
32.3#60
Tool use
24.1#35
8.7#139
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

11 reported for LongCat-Flash-Thinking-2601 · 9 for Solar Pro 4

4 shared

LongCat-Flash-Thinking-2601 outperforms in 1 benchmarks (BrowseComp), while Solar Pro 4 is better at 3 benchmarks (GPQA, LiveCodeBench, SWE-Bench Verified).

Solar Pro 4 shows notably better performance in the majority of benchmarks.

Sun Sep 27 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

For input processing, LongCat-Flash-Thinking-2601 ($0.30/1M tokens) costs the same as Solar Pro 4 ($0.30/1M tokens).

For output processing, LongCat-Flash-Thinking-2601 ($1.20/1M tokens) costs the same as Solar Pro 4 ($1.20/1M tokens).

In conclusion, LongCat-Flash-Thinking-2601 and Solar Pro 4 cost the same.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Sun Sep 27 2026 • llm-stats.com
Meituan
LongCat-Flash-Thinking-2601
Input tokens$0.30
Output tokens$1.20
Best providerMeituan
Upstage
Solar Pro 4
Input tokens$0.30
Output tokens$1.20
Best providerUnknown Organization
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Solar Pro 4 accepts 524,288 input tokens compared to LongCat-Flash-Thinking-2601's 128,000 tokens. Solar Pro 4 can generate longer responses up to 131,072 tokens, while LongCat-Flash-Thinking-2601 is limited to 128,000 tokens.

Meituan
LongCat-Flash-Thinking-2601
Input128,000 tokens
Output128,000 tokens
Upstage
Solar Pro 4
Input524,288 tokens
Output131,072 tokens
Sun Sep 27 2026 • llm-stats.com

License

Usage and distribution terms

LongCat-Flash-Thinking-2601 is licensed under MIT, while Solar Pro 4 uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

LongCat-Flash-Thinking-2601

MIT

Open weights

Solar Pro 4

Proprietary

Closed source

Release Timeline

When each model was launched

LongCat-Flash-Thinking-2601 was released on 2026-01-14, while Solar Pro 4 was released on 2026-08-06.

Solar Pro 4 is 7 months newer than LongCat-Flash-Thinking-2601.

LongCat-Flash-Thinking-2601

Jan 14, 2026

8 months ago

Solar Pro 4

Aug 6, 2026

1 months ago

6mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

LongCat-Flash-Thinking-2601 is available from Meituan. Solar Pro 4 is available from Upstage.

LongCat-Flash-Thinking-2601

meituan logo
Meituan
Input Price:Input: $0.30/1MOutput Price:Output: $1.20/1M

Solar Pro 4

upstage logo
Unknown Organization
Input Price:Input: $0.30/1MOutput Price:Output: $1.20/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against LongCat-Flash-Thinking-2601 and Solar Pro 4 side-by-side, then vote on the output you prefer.

LongCat-Flash-Thinking-2601
✓ Preferred
Solar Pro 4
Open in Playground

FAQ

Common questions about LongCat-Flash-Thinking-2601 vs Solar Pro 4.

Which is better, LongCat-Flash-Thinking-2601 or Solar Pro 4?

LongCat-Flash-Thinking-2601 and Solar Pro 4 are closely matched on the LLM Stats Score at 35.3 and 35.1. LongCat-Flash-Thinking-2601 is made by Meituan and Solar Pro 4 is made by Upstage. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does LongCat-Flash-Thinking-2601 compare to Solar Pro 4 in benchmarks?

LongCat-Flash-Thinking-2601 scores AIME 2025: 99.6%, Tau2 Telecom: 99.3%, Tau2 Retail: 88.6%, LiveCodeBench: 82.8%, GPQA: 80.5%. Solar Pro 4 scores AIME 2026: 95.3%, GPQA: 89.0%, LiveCodeBench: 87.8%, MMLU-Pro: 86.3%, AA-LCR: 71.0%.

Is LongCat-Flash-Thinking-2601 cheaper than Solar Pro 4?

Both models cost $0.30 per million input tokens.

What are the context window sizes for LongCat-Flash-Thinking-2601 and Solar Pro 4?

LongCat-Flash-Thinking-2601 supports 128K tokens and Solar Pro 4 supports 524K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between LongCat-Flash-Thinking-2601 and Solar Pro 4?

Key differences include LLM Stats Score (35.3 vs 35.1), context window (128K vs 524K), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes LongCat-Flash-Thinking-2601 and Solar Pro 4?

LongCat-Flash-Thinking-2601 is developed by Meituan and Solar Pro 4 is developed by Upstage.

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