Chat turn cost
1K fresh input + 500 output tokens
Claude Haiku 4.5
Claude Haiku 4.5 has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.
Confidence: listed-rates
Claude 4 Sonnet vs Claude Haiku 4.5
Updated September 29, 2026. Rank says Claude Haiku 4.5 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 Haiku 4.5 has the higher public score estimate, 42.47 versus 35.92, but the 90% score intervals overlap. Treat that as a lead, not a settled winner. 2 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.
- Shared results
- 2
- Claude 4 Sonnet only
- 1
- Claude Haiku 4.5 only
- 8
- Like-for-like categories
- 0 / 8
Estimated: Claude 4 Sonnet and Claude Haiku 4.5How 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.
Show secondary and unsupported calls
Repository review cost
50K fresh input + 3K output tokens
Claude Haiku 4.5
Claude Haiku 4.5 has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.
Confidence: listed-ratesCoding work
Code generation, repair, and software-engineering tasks
Not enough matched evidence
Claude 4 Sonnet is not ranked on the public lane for coding, so no winner is named for coding.
Confidence: limitedAgentic work
Tool use, computer use, and multi-step task completion
Not enough matched evidence
Claude 4 Sonnet is not ranked on the public lane for agentic, so no winner is named for agentic.
Confidence: limitedLong documents
Prompts that approach the documented context limit
No clear pick
The documented context windows are equal.
Confidence: documentedCache-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. Claude 4 Sonnet does not fit this workload in one request. Claude Haiku 4.5 does not fit this workload in one request. Claude 4 Sonnet 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.
—Claude 4 Sonnet19.6Claude Haiku 4.5
Not comparable · BenchAlign v5.7
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.
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.
1 Claude 4 Sonnet only
2 Shared
8 Claude Haiku 4.5 only
1 category rests 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 VerifiedCoding
Normalized gap 0.6Claude 4 Sonnet:72.7%Claude Haiku 4.5:73.3%
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.
Knowledge
Directional only- Claude 4 Sonnet
- 37.0
- Estimated · #108/169
- Claude Haiku 4.5
- 34.8
- Estimated · #119/169
- Basis
- BenchAlign v5.7 lane · 0 vs 2 public rows
- Reading
- Directional only
Agentic
Not comparable- Claude 4 Sonnet
- Not ranked
- Claude Haiku 4.5
- 22.0
- Supported · #96/117
- Basis
- BenchAlign v5.7 lane · 2 vs 2 public rows
- Reading
- Not comparable
Coding
Not comparable- Claude 4 Sonnet
- Not ranked
- Claude Haiku 4.5
- 19.6
- Supported · #124/143
- Basis
- BenchAlign v5.7 lane · 1 vs 4 public rows
- Reading
- Not comparable
Reasoning
Not comparable- Claude 4 Sonnet
- 52.5
- Unranked · 2 rankable rows
- Claude Haiku 4.5
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Multimodal
Not comparable- Claude 4 Sonnet
- 53.0
- Unranked · 1 rankable row
- Claude Haiku 4.5
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Multilingual
Not comparable- Claude 4 Sonnet
- Not ranked
- Claude Haiku 4.5
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Instruction following
Not comparable- Claude 4 Sonnet
- 52.0
- #78/124
- Claude Haiku 4.5
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Math
Not comparable- Claude 4 Sonnet
- Not ranked
- Claude Haiku 4.5
- 28.8
- Unranked · 2 rankable rows
- Basis
- Provisional lane · 0 vs 2 weighted rows
- Reading
- Not comparable
| Category | Claude 4 Sonnet | Claude Haiku 4.5 | Basis | Reading |
|---|---|---|---|---|
| Knowledge | 37.0Estimated · #108/169 | 34.8Estimated · #119/169 | Directional onlyBenchAlign v5.7 lane · 0 vs 2 public rows | Directional only |
| Agentic | Not ranked | 22.0Supported · #96/117 | Not comparableBenchAlign v5.7 lane · 2 vs 2 public rows | Not comparable |
| Coding | Not ranked | 19.6Supported · #124/143 | Not comparableBenchAlign v5.7 lane · 1 vs 4 public rows | Not comparable |
| Reasoning | 52.5Unranked · 2 rankable rows | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Multimodal | 53.0Unranked · 1 rankable row | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Multilingual | Not ranked | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Instruction following | 52.0#78/124 | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Math | Not ranked | 28.8Unranked · 2 rankable rows | Not comparableProvisional lane · 0 vs 2 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 4 Sonnet
- $0.0105
- Fits in one request
- Claude Haiku 4.5
- $0.0035
- Fits in one request
Claude Haiku 4.5 has the lower modeled cost
Costs use the listed standard API rates.
Repository review
50K fresh input + 3K output tokens
- Claude 4 Sonnet
- $0.195
- Fits in one request
- Claude Haiku 4.5
- $0.065
- Fits in one request
Claude Haiku 4.5 has the lower modeled cost
Costs use the listed standard API rates.
Cache-heavy agent loop
200K cached + 20K fresh input + 10K output tokens
- Claude 4 Sonnet
- $0.81
- Does not fit in one request
- Cached input priced at the published list-input rate
- Claude Haiku 4.5
- $0.09
- Does not fit in one request
Claude 4 Sonnet does not fit this workload in one request. Claude Haiku 4.5 does not fit this workload in one request. Claude 4 Sonnet has no published cached-input rate, so cached tokens use its listed input 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 4 SonnetClaude Haiku 4.5
Context window
Maximum documented context; output-token limits may be lower.
Claude 4 Sonnet
200K
Claude Haiku 4.5
API model ID
Claude 4 Sonnet
Not sourced
Claude Haiku 4.5
claude-haiku-4-5-20251001
Claude API pricingCached-input rate
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
Claude 4 Sonnet
Not published
Claude Haiku 4.5
$0.1 per 1M cached input tokens
Claude API pricingDocumented inputs
Claude 4 Sonnet
Not sourced
Claude Haiku 4.5
Not sourced
Documented outputs
Claude 4 Sonnet
Not sourced
Claude Haiku 4.5
Not sourced
Provider availability
Claude 4 Sonnet
Not sourced
Claude Haiku 4.5
Not sourced
Reasoning profile
Claude 4 Sonnet
Non-Reasoning
Claude Haiku 4.5
Non-Reasoning
Weight access
Claude 4 Sonnet
Proprietary
Claude Haiku 4.5
Proprietary
License
Claude 4 Sonnet
Proprietary
Claude Haiku 4.5
Proprietary
Release date
Claude 4 Sonnet
2025-05-01
Claude Haiku 4.5
2025-10-15
If you already use one of these models
- Deployment change
- Both entries list Anthropic as the provider. Confirm endpoint, model ID, limits, and feature support before switching.
- Quality signal
- Claude Haiku 4.5 has the higher public score estimate, 42.47 versus 35.92, but the 90% score intervals overlap.
- Workload cost
- Repository review: $0.195 vs $0.065. Cache-heavy agent loop: $0.81 vs $0.09.
- Context tradeoff
- Both models list 200K.
Run the same representative tasks against both endpoints before changing production traffic.
Questions
Which is better, Claude 4 Sonnet or Claude Haiku 4.5?
Claude Haiku 4.5 has the higher public score estimate, 42.47 versus 35.92, 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 4 Sonnet or Claude Haiku 4.5?
Claude 4 Sonnet is not ranked on the public lane for coding, so no winner is named for coding.
Which is better for agentic tasks, Claude 4 Sonnet or Claude Haiku 4.5?
Claude 4 Sonnet is not ranked on the public lane for agentic tasks, so no winner is named for agentic tasks.
Which costs less, Claude 4 Sonnet or Claude Haiku 4.5?
For the stated presets, chat costs $0.0105 on Claude 4 Sonnet and $0.0035 on Claude Haiku 4.5; repository review costs $0.195 and $0.065; the cache-heavy agent loop costs $0.81 and $0.09. Claude 4 Sonnet does not fit this workload in one request. Claude Haiku 4.5 does not fit this workload in one request. Claude 4 Sonnet has no published cached-input rate, so cached tokens use its listed input rate.
Which has the larger context window, Claude 4 Sonnet or Claude Haiku 4.5?
Both models list the same context window, 200K.
Benchmark evidence
The full public result ledger is available for audit without forcing a wide desktop table onto a phone.
Browse raw public benchmark evidence11 rows
Agentic
Gert Labs
Claude 4 Sonnet39.66%SourceClaude Haiku 4.5—Not directly comparable
JobBench
Shared sourceClaude 4 Sonnet18.4%Claude Haiku 4.516.0%Claude 4 Sonnet leads this result
Terminal-Bench 2.1 (Vals)
Claude 4 Sonnet—Claude Haiku 4.543.8%SourceNot directly comparable
Coding
SWE-bench Verified
Claude 4 Sonnet72.7%SourceClaude Haiku 4.573.3%SourceClaude Haiku 4.5 leads this result
VulcanBench v3
Claude 4 Sonnet—Claude Haiku 4.576.2%SourceNot directly comparable
LiveCodeBench (Vals)
Claude 4 Sonnet—Claude Haiku 4.541.2%SourceNot directly comparable
SWE-bench (Vals)
Claude 4 Sonnet—Claude Haiku 4.566.6%SourceNot directly comparable
Knowledge
Math
11 public results · 2 shared
Watch Claude 4 Sonnet vs Claude Haiku 4.5
One weekly email when material rank, price, or benchmark evidence changes make this matchup worth revisiting.
Read a sample issueJoin 2,000+ readers.
Last updated September 29, 2026