Agentic
Not comparable- Qwen3.5 Plus
- Not measured
- Qwen3.8-Flash-Next
- Not measured
- Weighted basis
- 0 vs 0 rows
- Reading
- Not comparable
Qwen3.5 Plus vs Qwen3.8-Flash-Next
Updated August 26, 2026. Public scores include evidence status and uncertainty. They are not guarantees for a specific workload.
Decision reading
Qwen3.8-Flash-Next has the higher public score estimate, 67.54 versus 47.72, but the 90% score intervals overlap. Treat that as a lead, not a settled winner.
1 results are shared. Category rows based on different benchmark sets are marked directional and do not name a winner.
Which one for your work
Recommendations appear only when a shared evidence basis or an explicit operating constraint supports the call. Secondary and unsupported use cases stay disclosed below the initial list.
Long documents
Prompts that approach the documented context limit
Qwen3.5 Plus
Qwen3.5 Plus has the larger documented context window.
Confidence: documented
Show secondary and unsupported calls
Coding work
Code generation, repair, and software-engineering tasks
Not enough matched evidence
No shared weighted benchmark basis supports a winner.
Confidence: limited
Agentic work
Tool use, computer use, and multi-step task completion
Not enough matched evidence
No shared weighted benchmark basis supports a winner.
Confidence: limited
Chat turn cost
1K fresh input + 500 output tokens
Not enough matched evidence
A complete comparable API-rate estimate is not available for both models.
Confidence: listed-rates
Cache-heavy agent loop cost
200K cached + 20K fresh input + 10K output tokens
Not enough matched evidence
A complete comparable API-rate estimate is not available for both models.
Confidence: rate-fallback
Repository review cost
50K fresh input + 3K output tokens
Not enough matched evidence
A complete comparable API-rate estimate is not available for both models.
Confidence: listed-rates
What is actually comparable
Shared results can support a head-to-head reading. Results present for only one model describe coverage, not superiority.
3 Qwen3.5 Plus only
1 Shared
23 Qwen3.8-Flash-Next only
- Shared results
- 1
- Qwen3.5 Plus only
- 3
- Qwen3.8-Flash-Next only
- 23
- Like-for-like categories
- 0 / 8
Category results, on a stated basis
Each row states whether both averages use the same weighted benchmark set. Directional and not-comparable rows remain visible, but they never receive a winner in this template.
Coding
Not comparable- Qwen3.5 Plus
- Not measured
- Qwen3.8-Flash-Next
- 62.5
- Weighted basis
- 0 vs 1 rows
- Reading
- Not comparable
Reasoning
Not comparable- Qwen3.5 Plus
- Not measured
- Qwen3.8-Flash-Next
- Not measured
- Weighted basis
- 0 vs 0 rows
- Reading
- Not comparable
Knowledge
Not comparable- Qwen3.5 Plus
- Not measured
- Qwen3.8-Flash-Next
- 43.4
- Weighted basis
- 0 vs 2 rows
- Reading
- Not comparable
Math
Not comparable- Qwen3.5 Plus
- 16.3
- Qwen3.8-Flash-Next
- Not measured
- Weighted basis
- 2 vs 0 rows
- Reading
- Not comparable
Multilingual
Not comparable- Qwen3.5 Plus
- Not measured
- Qwen3.8-Flash-Next
- Not measured
- Weighted basis
- 0 vs 0 rows
- Reading
- Not comparable
Multimodal
Not comparable- Qwen3.5 Plus
- Not measured
- Qwen3.8-Flash-Next
- 90.6
- Weighted basis
- 0 vs 1 rows
- Reading
- Not comparable
Instruction following
Not comparable- Qwen3.5 Plus
- Not measured
- Qwen3.8-Flash-Next
- 81.3
- Weighted basis
- 0 vs 1 rows
- Reading
- Not comparable
| Category | Qwen3.5 Plus | Qwen3.8-Flash-Next | Weighted basis | Reading |
|---|---|---|---|---|
| Agentic | Not measured | Not measured | Not comparable0 vs 0 rows | Not comparable |
| Coding | Not measured | 62.5 | Not comparable0 vs 1 rows | Not comparable |
| Reasoning | Not measured | Not measured | Not comparable0 vs 0 rows | Not comparable |
| Knowledge | Not measured | 43.4 | Not comparable0 vs 2 rows | Not comparable |
| Math | 16.3 | Not measured | Not comparable2 vs 0 rows | Not comparable |
| Multilingual | Not measured | Not measured | Not comparable0 vs 0 rows | Not comparable |
| Multimodal | Not measured | 90.6 | Not comparable0 vs 1 rows | Not comparable |
| Instruction following | Not measured | 81.3 | Not comparable0 vs 1 rows | Not comparable |
Shape of the matched evidence
Only shared public evidence is shown. Sparse evidence stays a ruled list rather than being closed into a radar shape.
A shared-evidence shape is not available.
BenchLM does not draw a radar or infer missing axes when the matched evidence is too sparse.
What each workload costs
Three fixed token mixes turn per-token rates into comparable decisions. Each scenario states context fit and whether cached input had to fall back to the published list-input rate.
Chat turn
1K fresh input + 500 output tokens
- Qwen3.5 Plus
- $0.0016
- Fits in one request
- Qwen3.8-Flash-Next
- Self-hosted; infrastructure cost varies
- Fits in one request
Qwen3.8-Flash-Next has no comparable published API token rate.
Repository review
50K fresh input + 3K output tokens
- Qwen3.5 Plus
- $0.0272
- Fits in one request
- Qwen3.8-Flash-Next
- Self-hosted; infrastructure cost varies
- Fits in one request
Qwen3.8-Flash-Next has no comparable published API token rate.
Cache-heavy agent loop
200K cached + 20K fresh input + 10K output tokens
- Qwen3.5 Plus
- $0.112
- Fits in one request
- Cached input priced at the published list-input rate
- Qwen3.8-Flash-Next
- Self-hosted; infrastructure cost varies
- Fits in one request
- Cached-input rate unavailable
Qwen3.5 Plus has no published cached-input rate, so cached tokens use its listed input rate. Qwen3.8-Flash-Next has no comparable published API token rate.
Specification differences
Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.
SpecificationQwen3.5 PlusQwen3.8-Flash-Next
Context window
Maximum documented context; output-token limits may be lower.
Qwen3.5 Plus
1M
Qwen3.8-Flash-Next
API model ID
Qwen3.5 Plus
Not sourced
Qwen3.8-Flash-Next
Qwen/Qwen3.8-Flash-Next
Qwen3.8-Flash-Next model cardCached-input rate
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
Qwen3.5 Plus
Not published
Qwen3.8-Flash-Next
No comparable hosted API rate
Qwen3.8-Flash-Next model cardDocumented inputs
Qwen3.5 Plus
Not sourced
Qwen3.8-Flash-Next
Not sourced
Documented outputs
Qwen3.5 Plus
Not sourced
Qwen3.8-Flash-Next
Not sourced
Provider availability
Qwen3.5 Plus
Not sourced
Qwen3.8-Flash-Next
Not sourced
Reasoning profile
Qwen3.5 Plus
Reasoning
Qwen3.8-Flash-Next
Reasoning
Weight access
Qwen3.5 Plus
Proprietary
Qwen3.8-Flash-Next
Open Weight
License
Qwen3.5 Plus
Proprietary
Qwen3.8-Flash-Next
Open Weight
Release date
Qwen3.5 Plus
2026-03-04
Qwen3.8-Flash-Next
2026-08-26
If you already use one of these models
- Deployment change
- Both entries list Alibaba as the provider. Confirm endpoint, model ID, limits, and feature support before switching.
- Quality signal
- Qwen3.8-Flash-Next has the higher public score estimate, 67.54 versus 47.72, but the 90% score intervals overlap.
- Workload cost
- A complete comparable API-rate estimate is not available for both models.
- Context tradeoff
- Qwen3.5 Plus has the larger documented window (1M).
Run the same representative tasks against both endpoints before changing production traffic.
Benchmark evidence
The full public result ledger is available for audit without forcing a wide desktop table onto a phone.
Browse raw public benchmark evidence27 rows
Agentic
JobBench
Qwen3.5 Plus18.5%SourceQwen3.8-Flash-Next55.7%SourceQwen3.8-Flash-Next leads this result
CoWorkBench
Qwen3.5 Plus—Qwen3.8-Flash-Next73.9%SourceNot directly comparable
Agents' Last Exam
Qwen3.5 Plus—Qwen3.8-Flash-Next51.2%SourceNot directly comparable
Toolathlon-Verified
Qwen3.5 Plus—Qwen3.8-Flash-Next73.5%SourceNot directly comparable
AndroidWorld
Qwen3.5 Plus—Qwen3.8-Flash-Next84.5%SourceNot directly comparable
OSWorld 2.0
Qwen3.5 Plus—Qwen3.8-Flash-Next19.4%SourceNot directly comparable
Coding
Vibe Code Bench
Qwen3.5 Plus15.74%SourceQwen3.8-Flash-Next—Not directly comparable
SWE-bench Pro
Qwen3.5 Plus—Qwen3.8-Flash-Next62.5%SourceNot directly comparable
SWE Multilingual
Qwen3.5 Plus—Qwen3.8-Flash-Next81%SourceNot directly comparable
NL2Repo
Qwen3.5 Plus—Qwen3.8-Flash-Next48.1%SourceNot directly comparable
deepSwe
Qwen3.5 Plus—Qwen3.8-Flash-Next58.7%SourceNot directly comparable
LiveCodeBench v6
Qwen3.5 Plus—Qwen3.8-Flash-Next91.9%SourceNot directly comparable
Knowledge
Math
Multimodal
Vision2Web
Qwen3.5 Plus—Qwen3.8-Flash-Next64.0%SourceNot directly comparable
ERQA
Qwen3.5 Plus—Qwen3.8-Flash-Next72.3%SourceNot directly comparable
LVBench
Qwen3.5 Plus—Qwen3.8-Flash-Next76.6%SourceNot directly comparable
RealWorldQA
Qwen3.5 Plus—Qwen3.8-Flash-Next88.5%SourceNot directly comparable
MathVision
Qwen3.5 Plus—Qwen3.8-Flash-Next90.6%SourceNot directly comparable
MathVision w/ Python
Qwen3.5 Plus—Qwen3.8-Flash-Next95.7%SourceNot directly comparable
CharXiv w/o tools
Qwen3.5 Plus—Qwen3.8-Flash-Next84.6%SourceNot directly comparable
CharXiv
Qwen3.5 Plus—Qwen3.8-Flash-Next90.6%SourceNot directly comparable
Instruction following
IFBench
Qwen3.5 Plus—Qwen3.8-Flash-Next81.3%SourceNot directly comparable
Frequently asked questions
Which is better, Qwen3.5 Plus or Qwen3.8-Flash-Next?
Qwen3.8-Flash-Next has the higher public score estimate, 67.54 versus 47.72, but the 90% score intervals overlap. The higher estimate is not a decisive winner because the uncertainty ranges overlap.
Which is better for coding, Qwen3.5 Plus or Qwen3.8-Flash-Next?
The published evidence does not provide a shared weighted coding basis for both models, so BenchLM does not name a coding winner.
Which is better for agentic tasks, Qwen3.5 Plus or Qwen3.8-Flash-Next?
The published evidence does not provide a shared weighted agentic tasks basis for both models, so BenchLM does not name a agentic tasks winner.
Which costs less, Qwen3.5 Plus or Qwen3.8-Flash-Next?
Both models do not have comparable published API token rates, so this page does not name a universal price winner.
Which has the larger context window, Qwen3.5 Plus or Qwen3.8-Flash-Next?
Qwen3.5 Plus has the larger documented context window: 1M, compared with 262K.
Related comparisons
Last updated August 26, 2026
Watch Qwen3.5 Plus vs Qwen3.8-Flash-Next
One weekly email when material rank, price, or benchmark evidence changes make this matchup worth revisiting.
Read a sample issueJoin 2,000+ readers.