Coding work
Code generation, repair, and software-engineering tasks
Not enough matched evidence
Claude Sonnet 5.5 is scored on Estimated evidence for coding, so the reading is directional rather than like-for-like.
Confidence: limited
Claude Sonnet 5.5 vs Hy4 preview
Updated September 28, 2026. Rank says Claude Sonnet 5.5 is ahead. Price, access, and your workload can each overturn that. Public scores include evidence status and uncertainty.
Both of these models will change. Get the price, version and retirement notices for the pair, each with its source. Follow model changes
Share or export
Decision reading
Claude Sonnet 5.5 has the higher public score estimate, 80.49 versus 60.26, but the 90% score intervals overlap. Treat that as a lead, not a settled winner. 9 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.
- Shared results
- 9
- Claude Sonnet 5.5 only
- 38
- Hy4 preview only
- 20
- Like-for-like categories
- 0 / 8
Estimated: Claude Sonnet 5.5 and Hy4 previewHow the comparison works
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.
No workload recommendation clears the current evidence threshold.
Use the matched evidence, workload costs, and sourced specifications below instead of treating a point score as a universal answer.
Show secondary and unsupported calls
Agentic work
Tool use, computer use, and multi-step task completion
Not enough matched evidence
Hy4 preview is scored on Estimated evidence for agentic, so the reading is directional rather than like-for-like.
Confidence: limitedLong documents
Prompts that approach the documented context limit
No clear pick
The documented context windows are equal.
Confidence: documentedChat 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-ratesCache-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: listed-ratesRepository 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
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.
79.6Claude Sonnet 5.560.4Hy4 preview
Directional only · BenchAlign v5.7
Claude Sonnet 5.5 scores higher, but at least one score rests on Estimated evidence or a different benchmark set. Directional only, no winner.
Coding scores combine specific tasks and setups. Match the editor, harness, and effort to your workflow.
Same basis rules as the category table below
What is actually comparable
Shared results can support a head-to-head reading. Results present for only one model describe coverage, not superiority.
38 Claude Sonnet 5.5 only
9 Shared
20 Hy4 preview only
3 categories rest on Estimated evidence or different evidence sets. Those rows remain visible for coverage context but do not name a winner.
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.
SWE-bench ProCoding
Normalized gap 15.6Claude Sonnet 5.5:81.3%Hy4 preview:65.7%HLE w/o toolsKnowledge
Normalized gap 13.5Claude Sonnet 5.5:56.9%Hy4 preview:43.4%SWE MultilingualCoding
Normalized gap 7.4Claude Sonnet 5.5:90.3%Hy4 preview:82.9%OfficeQA ProMultimodal
Normalized gap 0.6Claude Sonnet 5.5:65.6%Hy4 preview:66.2%
Bars run 0–100 on each benchmark’s normalized display scale
Category results, on a stated basis
Each row shows the public-lane category score for both models: the BenchAlign v5.7 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.
Agentic
Directional only- Claude Sonnet 5.5
- 66.1
- Supported · #10/111
- Hy4 preview
- 52.9
- Estimated · #34/111
- Basis
- BenchAlign v5.7 lane · 11 vs 14 public rows
- Reading
- Directional only
Coding
Directional only- Claude Sonnet 5.5
- 79.6
- Estimated · #3/136
- Hy4 preview
- 60.4
- Supported · #16/136
- Basis
- BenchAlign v5.7 lane · 9 vs 8 public rows
- Reading
- Directional only
Knowledge
Directional only- Claude Sonnet 5.5
- 80.9
- Supported · #6/160
- Hy4 preview
- 62.4
- Estimated · #32/160
- Basis
- BenchAlign v5.7 lane · 16 vs 4 public rows
- Reading
- Directional only
Reasoning
Not comparable- Claude Sonnet 5.5
- 79.2
- #7/27
- Hy4 preview
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Multimodal
Not comparable- Claude Sonnet 5.5
- 83.3
- Unranked · 7 rankable rows
- Hy4 preview
- 84.9
- Unranked · 1 rankable row
- Basis
- Provisional lane · 1 vs 1 weighted rows
- Reading
- Not comparable
Multilingual
Not comparable- Claude Sonnet 5.5
- Not ranked
- Hy4 preview
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Instruction following
Not comparable- Claude Sonnet 5.5
- Not ranked
- Hy4 preview
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Math
Not comparable- Claude Sonnet 5.5
- Not ranked
- Hy4 preview
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
| Category | Claude Sonnet 5.5 | Hy4 preview | Basis | Reading |
|---|---|---|---|---|
| Agentic | 66.1Supported · #10/111 | 52.9Estimated · #34/111 | Directional onlyBenchAlign v5.7 lane · 11 vs 14 public rows | Directional only |
| Coding | 79.6Estimated · #3/136 | 60.4Supported · #16/136 | Directional onlyBenchAlign v5.7 lane · 9 vs 8 public rows | Directional only |
| Knowledge | 80.9Supported · #6/160 | 62.4Estimated · #32/160 | Directional onlyBenchAlign v5.7 lane · 16 vs 4 public rows | Directional only |
| Reasoning | 79.2#7/27 | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Multimodal | 83.3Unranked · 7 rankable rows | 84.9Unranked · 1 rankable row | Not comparableProvisional lane · 1 vs 1 weighted rows | Not comparable |
| Multilingual | Not ranked | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Instruction following | Not ranked | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Math | Not ranked | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
Ranks count the models scored in each category’s lane, so the agentic, coding, and knowledge denominators (BenchAlign v5.7) differ from the provisional-lane categories. Unranked scores sit on the provisional lane’s scale but never name a winner. Like-for-like rows within 0.5 points read as a practical tie.
Supported evidence per lane · bars run 0–100Methodology
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
- Claude Sonnet 5.5
- $0.007
- Fits in one request
- Hy4 preview
- Self-hosted; infrastructure cost varies
- Fits in one request
Hy4 preview has no comparable published API token rate.
Repository review
50K fresh input + 3K output tokens
- Claude Sonnet 5.5
- $0.13
- Fits in one request
- Hy4 preview
- Self-hosted; infrastructure cost varies
- Fits in one request
Hy4 preview has no comparable published API token rate.
Cache-heavy agent loop
200K cached + 20K fresh input + 10K output tokens
- Claude Sonnet 5.5
- $0.18
- Fits in one request
- Hy4 preview
- Self-hosted; infrastructure cost varies
- Fits in one request
- Cached-input rate unavailable
Hy4 preview has no comparable published API token rate.
Cached input falls back to the list input rate only where a cached rate is unpublished
Specification differences
Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.
SpecificationClaude Sonnet 5.5Hy4 preview
Context window
Maximum documented context; output-token limits may be lower.
Claude Sonnet 5.5
Hy4 preview
API model ID
Claude Sonnet 5.5
claude-sonnet-5-5
Anthropic Claude Sonnet 5.5 model documentationHy4 preview
tencent/Hy4-preview
Tencent Hy4 preview model cardCached-input rate
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
Claude Sonnet 5.5
$0.2 per 1M cached input tokens
Claude API pricingHy4 preview
No comparable hosted API rate
Tencent Hy4 preview model cardDocumented inputs
Claude Sonnet 5.5
Hy4 preview
Not sourced
Documented outputs
Claude Sonnet 5.5
Hy4 preview
Not sourced
Provider availability
Claude Sonnet 5.5
Generally Available · Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry, Claude Platform on AWS
Anthropic Claude Sonnet 5.5 model documentationHy4 preview
Not sourced
Reasoning profile
Claude Sonnet 5.5
Reasoning
Hy4 preview
Reasoning
Weight access
Claude Sonnet 5.5
Proprietary
Hy4 preview
Open Weight
License
Claude Sonnet 5.5
Proprietary
Hy4 preview
Open Weight
Release date
Claude Sonnet 5.5
2026-09-28
Hy4 preview
2026-08-28
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
- Claude Sonnet 5.5 has the higher public score estimate, 80.49 versus 60.26, but the 90% score intervals overlap.
- Workload cost
- A complete comparable API-rate estimate is not available for both models.
- Context tradeoff
- Both models list 1M.
Run the same representative tasks against both endpoints before changing production traffic.
Questions
Which is better, Claude Sonnet 5.5 or Hy4 preview?
Claude Sonnet 5.5 has the higher public score estimate, 80.49 versus 60.26, but the 90% score intervals overlap. The higher estimate is not a decisive winner because the uncertainty ranges overlap.
Which is better for coding, Claude Sonnet 5.5 or Hy4 preview?
Claude Sonnet 5.5 scores higher for coding on the public lane, 79.6 to 60.4. Claude Sonnet 5.5 is scored on Estimated evidence for coding, so the reading is directional rather than like-for-like. BenchLM does not name a winner for coding from a directional reading; read the shared benchmark rows directly and test the models on the same task set.
Which is better for agentic tasks, Claude Sonnet 5.5 or Hy4 preview?
Claude Sonnet 5.5 scores higher for agentic tasks on the public lane, 66.1 to 52.9. Hy4 preview is scored on Estimated evidence for agentic tasks, so the reading is directional rather than like-for-like. BenchLM does not name a winner for agentic tasks from a directional reading; read the shared benchmark rows directly and test the models on the same task set.
Which costs less, Claude Sonnet 5.5 or Hy4 preview?
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, Claude Sonnet 5.5 or Hy4 preview?
Both models list the same context window, 1M.
Benchmark evidence
The full public result ledger is available for audit without forcing a wide desktop table onto a phone.
Browse raw public benchmark evidence67 rows
Agentic
Terminal-Bench 4.0
Claude Sonnet 5.570.60%SourceHy4 preview—Not directly comparable
HLE w/ tools
Claude Sonnet 5.564.5%SourceHy4 preview55.4%SourceClaude Sonnet 5.5 leads this result
DRACO
Claude Sonnet 5.587.0%SourceHy4 preview77.2%SourceClaude Sonnet 5.5 leads this result
Terminal-Bench-Science 0.1
Claude Sonnet 5.559.9%SourceHy4 preview—Not directly comparable
LAB all-pass (Harvey held-out)
Claude Sonnet 5.510.0%SourceHy4 preview—Not directly comparable
LAB criterion-pass (Harvey held-out)
Claude Sonnet 5.593.1%SourceHy4 preview—Not directly comparable
Toolathlon Verified Pass@3
Claude Sonnet 5.585.2%SourceHy4 preview—Not directly comparable
Toolathlon Verified Pass³
Claude Sonnet 5.568.5%SourceHy4 preview—Not directly comparable
Toolathlon Verified avg. turns
Claude Sonnet 5.531.6 turnsSourceHy4 preview—Not directly comparable
AutomationBench (Zapier 1.0.6)
Claude Sonnet 5.544.7%SourceHy4 preview—Not directly comparable
Toolathlon-Verified
Claude Sonnet 5.577.8%SourceHy4 preview74.1%SourceClaude Sonnet 5.5 leads this result
Terminal-Bench 2.1
Claude Sonnet 5.5—Hy4 preview85.4%SourceNot directly comparable
CyberGym
Claude Sonnet 5.5—Hy4 preview78.4%SourceNot directly comparable
WideResearch
Claude Sonnet 5.5—Hy4 preview83.9%SourceNot directly comparable
MCP Atlas
Claude Sonnet 5.5—Hy4 preview83.7%SourceNot directly comparable
APEX-Agents
Claude Sonnet 5.5—Hy4 preview37.1%SourceNot directly comparable
skillsBench
Claude Sonnet 5.5—Hy4 preview62.9%SourceNot directly comparable
JobBench
Claude Sonnet 5.5—Hy4 preview61.7%SourceNot directly comparable
Agents' Last Exam
Claude Sonnet 5.5—Hy4 preview22.8%SourceNot directly comparable
AutomationBench
Claude Sonnet 5.5—Hy4 preview32.1%SourceNot directly comparable
BankerToolBench
Claude Sonnet 5.5—Hy4 preview78.6%SourceNot directly comparable
Terminal-Bench 2.1 (Vals)
Claude Sonnet 5.5—Hy4 preview55.1%SourceNot directly comparable
Coding
FrontierCode 1.1 Main
Claude Sonnet 5.546.2%SourceHy4 preview—Not directly comparable
cursorBench40
Claude Sonnet 5.555.5%SourceHy4 preview—Not directly comparable
SWE-bench Pro
Claude Sonnet 5.581.3%SourceHy4 preview65.7%SourceClaude Sonnet 5.5 leads this result
SWE Multilingual
Claude Sonnet 5.590.3%SourceHy4 preview82.9%SourceClaude Sonnet 5.5 leads this result
SWE Multimodal
Claude Sonnet 5.554.3%SourceHy4 preview—Not directly comparable
DeepSWE
Claude Sonnet 5.571.0%SourceHy4 preview64.3%SourceClaude Sonnet 5.5 leads this result
FrontierCode 1.1 Extended
Claude Sonnet 5.559.1%SourceHy4 preview—Not directly comparable
ProgramBench
Claude Sonnet 5.579.7%SourceHy4 preview17.5%SourceClaude Sonnet 5.5 leads this result
FrontierSWE v2
Claude Sonnet 5.561.9%SourceHy4 preview—Not directly comparable
Terminal-Bench 2.1
Claude Sonnet 5.5—Hy4 preview85.4%SourceNot directly comparable
NL2Repo
Claude Sonnet 5.5—Hy4 preview58.9%SourceNot directly comparable
PostTrain Bench
Claude Sonnet 5.5—Hy4 preview35.6%SourceNot directly comparable
sweMarathon
Claude Sonnet 5.5—Hy4 preview31.9%SourceNot directly comparable
Reasoning
CritPt
Claude Sonnet 5.5—Hy4 preview16.9%SourceNot directly comparable
Multimodal
Chartography (no tools)
Claude Sonnet 5.561.6%SourceHy4 preview—Not directly comparable
Chartography (tools)
Claude Sonnet 5.590.2%SourceHy4 preview—Not directly comparable
BenchCAD Vision2Code (no tools)
Claude Sonnet 5.50.747SourceHy4 preview—Not directly comparable
BenchCAD Vision2Code (tools)
Claude Sonnet 5.50.963SourceHy4 preview—Not directly comparable
Biomedical image analysis
Claude Sonnet 5.572.2%SourceHy4 preview—Not directly comparable
OfficeQA
Claude Sonnet 5.576.9%SourceHy4 preview—Not directly comparable
OfficeQA Pro
Claude Sonnet 5.565.6%SourceHy4 preview66.2%SourceHy4 preview leads this result
Knowledge
HealthBench (raw)
Claude Sonnet 5.569.4%SourceHy4 preview—Not directly comparable
HealthBench (length-adjusted)
Claude Sonnet 5.565.4%SourceHy4 preview—Not directly comparable
HealthBench Professional (raw)
Claude Sonnet 5.577.1%SourceHy4 preview—Not directly comparable
HealthBench Professional
Claude Sonnet 5.569.2%SourceHy4 preview—Not directly comparable
BioMysteryBench (human-solvable)
Claude Sonnet 5.589.2%SourceHy4 preview—Not directly comparable
BioMysteryBench (human-difficult)
Claude Sonnet 5.544.7%SourceHy4 preview—Not directly comparable
SpatialBench Verified
Claude Sonnet 5.572.5%SourceHy4 preview—Not directly comparable
SingleCellBench
Claude Sonnet 5.559.1%SourceHy4 preview—Not directly comparable
Protein Design
Claude Sonnet 5.551.0%SourceHy4 preview—Not directly comparable
Morphology-to-molecule matching
Claude Sonnet 5.525.0%SourceHy4 preview—Not directly comparable
Medicinal chemistry
Claude Sonnet 5.565.3%SourceHy4 preview—Not directly comparable
Protein Design library ranking
Claude Sonnet 5.554.8%SourceHy4 preview—Not directly comparable
De novo protein-binder design
Claude Sonnet 5.582.3%SourceHy4 preview—Not directly comparable
Protocols (troubleshooting)
Claude Sonnet 5.567.3%SourceHy4 preview—Not directly comparable
Protocols (understanding)
Claude Sonnet 5.566.6%SourceHy4 preview—Not directly comparable
HLE w/o tools
Claude Sonnet 5.556.9%SourceHy4 preview43.4%SourceClaude Sonnet 5.5 leads this result
GPQA
Claude Sonnet 5.5—Hy4 preview92.3%SourceNot directly comparable
GPQA-D
Claude Sonnet 5.5—Hy4 preview92.3%SourceNot directly comparable
HLE
Claude Sonnet 5.5—Hy4 preview55.4%SourceNot directly comparable
Multilingual
Math
67 public results · 9 shared
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Last updated September 28, 2026