Qwen3.5 Plus 2026-02-15 vs Qwen3.8 Flash
Qwen3.8 Flash costs 3.3x less per output token than Qwen3.5 Plus 2026-02-15 ($0.47 vs $1.56 per million). Updated October 22, 2026; no benchmark has tested both models yet.
- Coding
- No data
- Overall
- No data
- Output $/M
- $1.56
- Coding
- No data
- Overall
- No data
- Output $/M
- $0.47
Qwen3.5 Plus 2026-02-15 or Qwen3.8 Flash: which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Compare them on price, context and the boards below.
No benchmark has tested both yet. Qwen3.5 Plus 2026-02-15 has results on Design Arena: websites, Design Arena: UI components and Design Arena: game dev; Qwen3.8 Flash on LiveBench coding, LiveBench research and LiveBench browser. Compare them on price and context instead.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Neither has a coding score yet.
One side not measured
Web design
Design Arena: websites
No call
Only Qwen3.5 Plus 2026-02-15 has a Design Arena: websites result, 1187.
Directional only
Long documents
Listed context window
No call
Both take 1M tokens.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Qwen3.8 Flash
Qwen3.5 Plus 2026-02-15 $0.0010, Qwen3.8 Flash $0.0004 per turn.
List prices
At a glance
- Coding index
- Qwen3.5 Plus 2026-02-15 not benchmarked, Qwen3.8 Flash not benchmarked.
- Widest category
- None yet: no category has been tested on both models.
- Widest single gap
- None yet: no benchmark has tested both models.
- Output price
- Qwen3.5 Plus 2026-02-15 $1.56 against Qwen3.8 Flash $0.47 per million output tokens, 3.3x apart.
- Context window
- Both take 1M tokens.
Benchmark by benchmark
Every board either model has a result on, a category to a fold; bars are each result on a 0 to 100 scale. Only one model is measured on each, so no row names a leader.
CodingDirectional onlySix of these boards feed the Vibe Coding Index1 board measured
| Benchmark | Qwen3.5 Plus 2026-02-15 | Qwen3.8 Flash | Leader |
|---|---|---|---|
| LiveBench coding | Not measured | 87.4% | Only Qwen3.8 Flash measured |
| Neither model has a result on the other 42 boards here | |||
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index3 boards measured
| Benchmark | Qwen3.5 Plus 2026-02-15 | Qwen3.8 Flash | Leader |
|---|---|---|---|
| LiveBench research | Not measured | 74.6% | Only Qwen3.8 Flash measured |
| LiveBench browser | Not measured | 48.0% | Only Qwen3.8 Flash measured |
| LiveBench long agentic | Not measured | 37.1% | Only Qwen3.8 Flash measured |
| Neither model has a result on the other 39 boards here | |||
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | Qwen3.5 Plus 2026-02-15 | Qwen3.8 Flash | Leader |
|---|---|---|---|
| LiveBench reasoning | Not measured | 87.4% | Only Qwen3.8 Flash measured |
| Neither model has a result on the other 22 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards measured
| Benchmark | Qwen3.5 Plus 2026-02-15 | Qwen3.8 Flash | Leader |
|---|---|---|---|
| Design Arena: websites | 1187 | Not measured | Only Qwen3.5 Plus 2026-02-15 measured |
| Design Arena: UI components | 1175 | Not measured | Only Qwen3.5 Plus 2026-02-15 measured |
| Design Arena: game dev | 1105 | Not measured | Only Qwen3.5 Plus 2026-02-15 measured |
| Design Arena: data viz | 1135 | Not measured | Only Qwen3.5 Plus 2026-02-15 measured |
| Design Arena: 3D | 1118 | Not measured | Only Qwen3.5 Plus 2026-02-15 measured |
| Design Arena: all code categories | 1166 | Not measured | Only Qwen3.5 Plus 2026-02-15 measured |
| Design Arena: SVG | 1107 | Not measured | Only Qwen3.5 Plus 2026-02-15 measured |
| Design Arena: ASCII art | 1094 | Not measured | Only Qwen3.5 Plus 2026-02-15 measured |
| LiveBench design | Not measured | 72.8% | Only Qwen3.8 Flash measured |
GeneralDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | Qwen3.5 Plus 2026-02-15 | Qwen3.8 Flash | Leader |
|---|---|---|---|
| LiveBench data analysis | Not measured | 74.2% | Only Qwen3.8 Flash measured |
| Neither model has a result on the other 47 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Qwen3.8 Flash costs less
Repository review
50K input + 3K output tokens
Qwen3.8 Flash costs less
Agent loop
200K input + 10K output tokens
Qwen3.8 Flash costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | Qwen3.5 Plus 2026-02-15 | Qwen3.8 Flash |
|---|---|---|
| Maker | Qwen | Qwen |
| Weights | No public weights listed | Open weights |
| Released | February 16, 2026 | August 26, 2026 |
| Context window | 1M | 1M |
| Input $/Mtok | $0.26 | $0.15 |
| Output $/Mtok | $1.56 | $0.47 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 0 | 1 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Qwen3.5 Plus 2026-02-15 better than Qwen3.8 Flash for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Compare them on price, context and the boards below.
Which is cheaper, Qwen3.5 Plus 2026-02-15 or Qwen3.8 Flash?
Qwen3.5 Plus 2026-02-15 costs $0.26 per million input tokens and $1.56 per million output tokens; Qwen3.8 Flash costs $0.15 and $0.47. Cost per solved task is known for neither of them.
Which has the bigger context window, Qwen3.5 Plus 2026-02-15 or Qwen3.8 Flash?
Neither: both take 1M tokens.
Has any benchmark tested both Qwen3.5 Plus 2026-02-15 and Qwen3.8 Flash?
No benchmark has tested both yet. Qwen3.5 Plus 2026-02-15 has results on Design Arena: websites, Design Arena: UI components and Design Arena: game dev; Qwen3.8 Flash on LiveBench coding, LiveBench research and LiveBench browser. Compare them on price and context instead. Data as of October 22, 2026.