Skip to main content
Radar

Every change to the models you run, with its source and its date. Releases, price changes, retirements, API changes, and incidents.Every change to the models you run, with its source.

Follow model changes
BenchLM

Qwen3.5 397B vs Step 5 Preview

Decision reading

At least one model is not scored in the current public ranking lane, so the page does not name an overall quality winner.

4 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.

Alibaba logo
Model A
Qwen3.5 397B

Alibaba

55.25/100

Estimated · Public rank #96

90% interval 43.7–66.8

StepFun logo
Model B
Step 5 Preview

StepFun

—

Evidence status unavailable

90% interval unavailable

Updated September 21, 2026. We do not rank this pair: at least one has no public score. Public scores include evidence status and uncertainty.

Share or export

Share on XLinkedInSocial cardCSVJSON

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

    Step 5 Preview

    Step 5 Preview has the larger documented context window.

    Confidence: documented

  • Chat turn cost

    1K fresh input + 500 output tokens

    Step 5 Preview

    Step 5 Preview has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.

    Confidence: listed-rates

Show secondary and unsupported calls

  • Repository review cost

    50K fresh input + 3K output tokens

    Qwen3.5 397B

    Qwen3.5 397B has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.

    Confidence: listed-rates

  • Coding work

    Code generation, repair, and software-engineering tasks

    Not enough matched evidence

    Step 5 Preview is not ranked on the public lane for coding, so no winner is named for coding.

    Confidence: limited

  • Agentic work

    Tool use, computer use, and multi-step task completion

    Not enough matched evidence

    Step 5 Preview is not ranked on the public lane for agentic, so no winner is named for agentic.

    Confidence: limited

  • Cache-heavy agent loop cost

    200K cached + 20K fresh input + 10K output tokens

    Not enough matched evidence

    The page does not recommend a cost winner because at least one model cannot fit the stated workload in one request. Qwen3.5 397B does not fit this workload in one request. Qwen3.5 397B has no published cached-input rate, so cached tokens use its listed input rate.

    Confidence: rate-fallback

Which one for a specific job

Choose a job from the LLM Selector's task catalog to see the category row it rests on, under the same basis rules as the table below. A directional row stays directional; choosing a job never creates a winner.

The same task catalog as the LLM Selector. Each job names the evidence surface it rests on; nothing here adds a new score.

50.8Qwen3.5 397B—Step 5 Preview

Not comparable · BenchAlign

The coding row is not comparable on the public lane: at least one model is not measured or not ranked there.

Coding scores combine specific tasks and setups. Match the editor, harness, and effort to your workflow.

Open the coding leaderboardShortlist models for this job

What is actually comparable

Shared results can support a head-to-head reading. Results present for only one model describe coverage, not superiority.

Shared results
4
Qwen3.5 397B only
34
Step 5 Preview only
18
Like-for-like categories
0 / 8

1 category rests on Estimated evidence or different evidence sets. Those rows remain visible for coverage context but do not name a winner.

Category results, on a stated basis

Each row shows the public-lane category score for both models: the BenchAlign lane for agentic, coding, and knowledge, and the weighted public rows elsewhere, with the same rank each model page reports. A row is like-for-like only when both scores rest on Supported evidence or the same weighted set. Directional and not-comparable rows remain visible, but they never receive a winner.

Multimodal

Directional only
Qwen3.5 397B
62.9
#27/49
Step 5 Preview
61.2
#28/49
Basis
Provisional lane · 2 vs 2 weighted rows
Reading
Directional only

Agentic

Not comparable
Qwen3.5 397B
46.9
Estimated · #79/154
Step 5 Preview
Not ranked
Basis
BenchAlign lane · 13 vs 11 public rows
Reading
Not comparable

Coding

Not comparable
Qwen3.5 397B
50.8
Estimated · #60/156
Step 5 Preview
Not ranked
Basis
BenchAlign lane · 3 vs 6 public rows
Reading
Not comparable

Reasoning

Not comparable
Qwen3.5 397B
59.8
Unranked · 2 rankable rows
Step 5 Preview
78.5
Unranked · 2 rankable rows
Basis
Provisional lane · 1 vs 0 weighted rows
Reading
Not comparable

Knowledge

Not comparable
Qwen3.5 397B
50.4
Estimated · #83/186
Step 5 Preview
Not ranked
Basis
BenchAlign lane · 6 vs 2 public rows
Reading
Not comparable

Multilingual

Not comparable
Qwen3.5 397B
69.7
#5/12
Step 5 Preview
Not ranked
Basis
Provisional lane · 1 vs 0 weighted rows
Reading
Not comparable

Instruction following

Not comparable
Qwen3.5 397B
0.0
#124/124
Step 5 Preview
Not ranked
Basis
Provisional lane · 0 vs 0 weighted rows
Reading
Not comparable

Math

Not comparable
Qwen3.5 397B
73.5
Unranked · 5 rankable rows
Step 5 Preview
Not ranked
Basis
Provisional lane · 2 vs 0 weighted rows
Reading
Not comparable

Ranks count the models scored in each category’s lane, so the agentic, coding, and knowledge denominators (BenchAlign) differ from the provisional-lane categories. Unranked scores sit on the lane’s scale but never name a winner. Like-for-like rows within 0.5 points read as a practical tie.

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.

Too few matched category axes support a radar. The ruled list below shows only shared benchmark results; positions use each benchmark’s normalized display scale when available.

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 397B
$0.0024
Fits in one request
Step 5 Preview
$0.00235
Fits in one request

Step 5 Preview has the lower modeled cost

Costs use the listed standard API rates.

Repository review

50K fresh input + 3K output tokens

Qwen3.5 397B
$0.0408
Fits in one request
Step 5 Preview
$0.0581
Fits in one request

Qwen3.5 397B has the lower modeled cost

Costs use the listed standard API rates.

Cache-heavy agent loop

200K cached + 20K fresh input + 10K output tokens

Qwen3.5 397B
$0.168
Does not fit in one request
Cached input priced at the published list-input rate
Step 5 Preview
$0.057
Fits in one request

Qwen3.5 397B does not fit this workload in one request. Qwen3.5 397B has no published cached-input rate, so cached tokens use its listed input rate.

Specification differences

Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.

Cached-input rate

A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.

Qwen3.5 397B

Not published

Step 5 Preview

$0.05 per 1M cached input tokens

StepFun pricing and rate limits

Reasoning profile

Qwen3.5 397B

Non-Reasoning

Step 5 Preview

Reasoning

Weight access

Qwen3.5 397B

Open Weight

Step 5 Preview

Pending

License

Qwen3.5 397B

Open Weight

Step 5 Preview

Pending

Release date

Qwen3.5 397B

2026-02-16

Step 5 Preview

2026-09-20

If you already use one of these models
Deployment change
The models list different providers, so authentication, endpoint behavior, limits, and feature support may change.
Quality signal
At least one model is not scored in the current public ranking lane, so the page does not name an overall quality winner.
Workload cost
Repository review: $0.0408 vs $0.0581. Cache-heavy agent loop: $0.168 vs $0.057.
Context tradeoff
Step 5 Preview 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 evidence56 rows

Agentic

  • Terminal-Bench 2.0

    Qwen3.5 397B52.5%
    Source
    Step 5 Preview—

    Not directly comparable

  • BrowseComp

    Qwen3.5 397B62%
    Source
    Step 5 Preview88.7%
    Source

    Step 5 Preview leads this result

  • Claw-Eval

    Qwen3.5 397B56.8%
    Source
    Step 5 Preview—

    Not directly comparable

  • QwenClawBench

    Qwen3.5 397B51.8%
    Source
    Step 5 Preview—

    Not directly comparable

  • τ³-bench results

    Qwen3.5 397B68.4%
    Source
    Step 5 Preview—

    Not directly comparable

  • VITA-Bench

    Qwen3.5 397B43.7%
    Source
    Step 5 Preview—

    Not directly comparable

  • DeepPlanning

    Qwen3.5 397B37.6%
    Source
    Step 5 Preview—

    Not directly comparable

  • Toolathlon

    Qwen3.5 397B36.3%
    Source
    Step 5 Preview—

    Not directly comparable

  • MCP Atlas

    Qwen3.5 397B46.1%
    Source
    Step 5 Preview85.6%
    Source

    Step 5 Preview leads this result

  • MCP-Tasks

    Qwen3.5 397B74.2%
    Source
    Step 5 Preview—

    Not directly comparable

  • WideResearch

    Qwen3.5 397B74.0%
    Source
    Step 5 Preview—

    Not directly comparable

  • Gert Labs

    Qwen3.5 397B46.76%
    Source
    Step 5 Preview—

    Not directly comparable

  • ResearchClawBench

    Qwen3.5 397B14.2%
    Source
    Step 5 Preview—

    Not directly comparable

  • Terminal-Bench 2.1

    Qwen3.5 397B—
    Step 5 Preview85.0%
    Source

    Not directly comparable

  • Terminal-Bench 4.0

    Qwen3.5 397B—
    Step 5 Preview33.30%
    Source

    Not directly comparable

  • CyberGym

    Qwen3.5 397B—
    Step 5 Preview84.7%
    Source

    Not directly comparable

  • AutomationBench

    Qwen3.5 397B—
    Step 5 Preview44.0%
    Source

    Not directly comparable

  • Toolathlon-Verified

    Qwen3.5 397B—
    Step 5 Preview74.1%
    Source

    Not directly comparable

  • JobBench

    Qwen3.5 397B—
    Step 5 Preview59.0%
    Source

    Not directly comparable

  • APEX-Agents

    Qwen3.5 397B—
    Step 5 Preview37.8%
    Source

    Not directly comparable

  • DRACO

    Qwen3.5 397B—
    Step 5 Preview83.3%
    Source

    Not directly comparable

  • Agents' Last Exam

    Qwen3.5 397B—
    Step 5 Preview29.5%
    Source

    Not directly comparable

Coding

  • SWE-bench Verified

    Qwen3.5 397B76.2%
    Source
    Step 5 Preview—

    Not directly comparable

  • LiveCodeBench v6

    Qwen3.5 397B83.6%
    Source
    Step 5 Preview—

    Not directly comparable

  • SWE-bench Pro

    Qwen3.5 397B50.9%
    Source
    Step 5 Preview—

    Not directly comparable

  • DeepSWE

    Qwen3.5 397B—
    Step 5 Preview67.7%
    Source

    Not directly comparable

  • Terminal-Bench 2.1

    Qwen3.5 397B—
    Step 5 Preview85.0%
    Source

    Not directly comparable

  • SciCode

    Qwen3.5 397B—
    Step 5 Preview58.9%
    Source

    Not directly comparable

  • ProgramBench

    Qwen3.5 397B—
    Step 5 Preview80.5%
    Source

    Not directly comparable

  • sweMarathon

    Qwen3.5 397B—
    Step 5 Preview72.7%
    Source

    Not directly comparable

  • MLS-Bench Lite

    Qwen3.5 397B—
    Step 5 Preview40.5%
    Source

    Not directly comparable

Reasoning

  • LongBench v2

    Qwen3.5 397B63.2%
    Source
    Step 5 Preview—

    Not directly comparable

  • AI-Needle

    Qwen3.5 397B68.7%
    Source
    Step 5 Preview—

    Not directly comparable

  • CritPt

    Qwen3.5 397B—
    Step 5 Preview20.9%
    Source

    Not directly comparable

Multimodal

  • MMMU-Pro

    Qwen3.5 397B79%
    Source
    Step 5 Preview76%
    Source

    Qwen3.5 397B leads this result

  • MathVision

    Qwen3.5 397B88.6%
    Source
    Step 5 Preview—

    Not directly comparable

  • CharXiv

    Qwen3.5 397B80.8%
    Source
    Step 5 Preview—

    Not directly comparable

  • VideoMMMU

    Qwen3.5 397B84.7%
    Source
    Step 5 Preview—

    Not directly comparable

  • ScreenSpot Pro

    Qwen3.5 397B65.6%
    Source
    Step 5 Preview—

    Not directly comparable

  • V*

    Qwen3.5 397B95.8%
    Source
    Step 5 Preview—

    Not directly comparable

  • OfficeQA Pro

    Qwen3.5 397B—
    Step 5 Preview60.3%
    Source

    Not directly comparable

Knowledge

  • GPQA

    Qwen3.5 397B88.4%
    Source
    Step 5 Preview—

    Not directly comparable

  • SuperGPQA

    Qwen3.5 397B70.4%
    Source
    Step 5 Preview—

    Not directly comparable

  • MMLU-Pro

    Qwen3.5 397B87.8%
    Source
    Step 5 Preview—

    Not directly comparable

  • MMLU-Redux

    Qwen3.5 397B94.9%
    Source
    Step 5 Preview—

    Not directly comparable

  • C-Eval

    Qwen3.5 397B93%
    Source
    Step 5 Preview—

    Not directly comparable

  • HLE

    Qwen3.5 397B28.7%
    Source
    Step 5 Preview46.5%
    Source

    Step 5 Preview leads this result

  • GPQA-D

    Qwen3.5 397B—
    Step 5 Preview93.5%
    Source

    Not directly comparable

Multilingual

  • MMLU-ProX

    Qwen3.5 397B84.7%
    Source
    Step 5 Preview—

    Not directly comparable

  • NOVA-63

    Qwen3.5 397B59.1%
    Source
    Step 5 Preview—

    Not directly comparable

Instruction following

  • IFEval

    Qwen3.5 397B92.6%
    Source
    Step 5 Preview—

    Not directly comparable

Math

  • AIME26

    Qwen3.5 397B93.3%
    Source
    Step 5 Preview—

    Not directly comparable

  • HMMT Feb 2025

    Qwen3.5 397B94.8%
    Source
    Step 5 Preview—

    Not directly comparable

  • HMMT Nov 2025

    Qwen3.5 397B92.7%
    Source
    Step 5 Preview—

    Not directly comparable

  • HMMT Feb 2026

    Qwen3.5 397B87.9%
    Source
    Step 5 Preview—

    Not directly comparable

  • MMAnswerBench

    Qwen3.5 397B80.9%
    Source
    Step 5 Preview—

    Not directly comparable

Questions

Which is better, Qwen3.5 397B or Step 5 Preview?

At least one model is not scored in the current public ranking lane, so the page does not name an overall quality winner. The page therefore keeps the decision tied to the specific documented workload.

Which is better for coding, Qwen3.5 397B or Step 5 Preview?

Step 5 Preview is not ranked on the public lane for coding, so no winner is named for coding.

Which is better for agentic tasks, Qwen3.5 397B or Step 5 Preview?

Step 5 Preview is not ranked on the public lane for agentic tasks, so no winner is named for agentic tasks.

Which costs less, Qwen3.5 397B or Step 5 Preview?

For the stated presets, chat costs $0.0024 on Qwen3.5 397B and $0.00235 on Step 5 Preview; repository review costs $0.0408 and $0.0581; the cache-heavy agent loop costs $0.168 and $0.057. Qwen3.5 397B does not fit this workload in one request. Qwen3.5 397B has no published cached-input rate, so cached tokens use its listed input rate.

Which has the larger context window, Qwen3.5 397B or Step 5 Preview?

Step 5 Preview has the larger documented context window: 1M, compared with 128K.

Related comparisons

Compare API pricing Read the methodology Open the model selector

Last updated September 21, 2026

Watch Qwen3.5 397B vs Step 5 Preview

One weekly email when material rank, price, or benchmark evidence changes make this matchup worth revisiting.

Read a sample issue

Join 2,000+ readers.