Chat turn cost
1K fresh input + 500 output tokens
Claude 3 Haiku
Claude 3 Haiku has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.
Confidence: listed-rates
Claude 3 Haiku vs Claude Sonnet 4.5
Updated September 29, 2026. Rank says Claude Sonnet 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
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Decision reading
The public evidence has no benchmark result shared by both models, so it does not support a quality verdict. Use the documented cost, context, and runtime rows instead. 0 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.
- Shared results
- 0
- Claude 3 Haiku only
- 0
- Claude Sonnet 4.5 only
- 11
- Like-for-like categories
- 0 / 8
Supported: Claude 3 Haiku · Estimated: Claude Sonnet 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 3 Haiku
Claude 3 Haiku 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 3 Haiku and Claude Sonnet 4.5 are 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 3 Haiku 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 3 Haiku does not fit this workload in one request. Claude Sonnet 4.5 does not fit this workload in one request. Claude 3 Haiku has no published cached-input rate, so cached tokens use its listed input rate. Claude Sonnet 4.5 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 3 Haiku—Claude Sonnet 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.
11 Claude Sonnet 4.5 only
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.
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
Not comparable- Claude 3 Haiku
- Not ranked
- Claude Sonnet 4.5
- 34.6
- Estimated · #67/117
- Basis
- BenchAlign v5.7 lane · 0 vs 5 public rows
- Reading
- Not comparable
Coding
Not comparable- Claude 3 Haiku
- Not ranked
- Claude Sonnet 4.5
- Not ranked
- Basis
- BenchAlign v5.7 lane · 0 vs 1 public rows
- Reading
- Not comparable
Reasoning
Not comparable- Claude 3 Haiku
- 41.2
- Unranked · 2 rankable rows
- Claude Sonnet 4.5
- 19.2
- Unranked · 1 rankable row
- Basis
- Provisional lane · 0 vs 1 weighted rows
- Reading
- Not comparable
Multimodal
Not comparable- Claude 3 Haiku
- 26.4
- Unranked · 1 rankable row
- Claude Sonnet 4.5
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Knowledge
Not comparable- Claude 3 Haiku
- 20.1
- Estimated · #167/169
- Claude Sonnet 4.5
- Not ranked
- Basis
- BenchAlign v5.7 lane · 0 vs 1 public rows
- Reading
- Not comparable
Multilingual
Not comparable- Claude 3 Haiku
- Not ranked
- Claude Sonnet 4.5
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Instruction following
Not comparable- Claude 3 Haiku
- 39.9
- #102/124
- Claude Sonnet 4.5
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Math
Not comparable- Claude 3 Haiku
- Not ranked
- Claude Sonnet 4.5
- 34.6
- Unranked · 2 rankable rows
- Basis
- Provisional lane · 0 vs 2 weighted rows
- Reading
- Not comparable
| Category | Claude 3 Haiku | Claude Sonnet 4.5 | Basis | Reading |
|---|---|---|---|---|
| Agentic | Not ranked | 34.6Estimated · #67/117 | Not comparableBenchAlign v5.7 lane · 0 vs 5 public rows | Not comparable |
| Coding | Not ranked | Not ranked | Not comparableBenchAlign v5.7 lane · 0 vs 1 public rows | Not comparable |
| Reasoning | 41.2Unranked · 2 rankable rows | 19.2Unranked · 1 rankable row | Not comparableProvisional lane · 0 vs 1 weighted rows | Not comparable |
| Multimodal | 26.4Unranked · 1 rankable row | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Knowledge | 20.1Estimated · #167/169 | Not ranked | Not comparableBenchAlign v5.7 lane · 0 vs 1 public rows | Not comparable |
| Multilingual | Not ranked | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Instruction following | 39.9#102/124 | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Math | Not ranked | 34.6Unranked · 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.
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 3 Haiku
- $0.00088
- Fits in one request
- Claude Sonnet 4.5
- $0.0105
- Fits in one request
Claude 3 Haiku has the lower modeled cost
Costs use the listed standard API rates.
Repository review
50K fresh input + 3K output tokens
- Claude 3 Haiku
- $0.01625
- Fits in one request
- Claude Sonnet 4.5
- $0.195
- Fits in one request
Claude 3 Haiku 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 3 Haiku
- $0.0675
- Does not fit in one request
- Cached input priced at the published list-input rate
- Claude Sonnet 4.5
- $0.81
- Does not fit in one request
- Cached input priced at the published list-input rate
Claude 3 Haiku does not fit this workload in one request. Claude Sonnet 4.5 does not fit this workload in one request. Claude 3 Haiku has no published cached-input rate, so cached tokens use its listed input rate. Claude Sonnet 4.5 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 3 HaikuClaude Sonnet 4.5
Context window
Maximum documented context; output-token limits may be lower.
Claude 3 Haiku
200K
Claude Sonnet 4.5
200K
API model ID
Claude 3 Haiku
Not sourced
Claude Sonnet 4.5
Not sourced
Cached-input rate
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
Claude 3 Haiku
Not published
Claude Sonnet 4.5
Not published
Documented inputs
Claude 3 Haiku
Not sourced
Claude Sonnet 4.5
Not sourced
Documented outputs
Claude 3 Haiku
Not sourced
Claude Sonnet 4.5
Not sourced
Provider availability
Claude 3 Haiku
Not sourced
Claude Sonnet 4.5
Not sourced
Reasoning profile
Claude 3 Haiku
Non-Reasoning
Claude Sonnet 4.5
Non-Reasoning
Weight access
Claude 3 Haiku
Proprietary
Claude Sonnet 4.5
Proprietary
License
Claude 3 Haiku
Proprietary
Claude Sonnet 4.5
Proprietary
Release date
Claude 3 Haiku
2024-03-01
Claude Sonnet 4.5
2025-09-01
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
- The public evidence has no benchmark result shared by both models, so it does not support a quality verdict.
- Workload cost
- Repository review: $0.01625 vs $0.195. Cache-heavy agent loop: $0.0675 vs $0.81.
- Context tradeoff
- Both models list 200K.
Run the same representative tasks against both endpoints before changing production traffic.
Questions
Which is better, Claude 3 Haiku or Claude Sonnet 4.5?
The public evidence has no benchmark result shared by both models, so it does not support a quality verdict. The page therefore keeps the decision tied to the specific documented workload.
Which is better for coding, Claude 3 Haiku or Claude Sonnet 4.5?
Claude 3 Haiku and Claude Sonnet 4.5 are not ranked on the public lane for coding, so no winner is named for coding.
Which is better for agentic tasks, Claude 3 Haiku or Claude Sonnet 4.5?
Claude 3 Haiku is not ranked on the public lane for agentic tasks, so no winner is named for agentic tasks.
Which costs less, Claude 3 Haiku or Claude Sonnet 4.5?
For the stated presets, chat costs $0.00088 on Claude 3 Haiku and $0.0105 on Claude Sonnet 4.5; repository review costs $0.01625 and $0.195; the cache-heavy agent loop costs $0.0675 and $0.81. Claude 3 Haiku does not fit this workload in one request. Claude Sonnet 4.5 does not fit this workload in one request. Claude 3 Haiku has no published cached-input rate, so cached tokens use its listed input rate. Claude Sonnet 4.5 has no published cached-input rate, so cached tokens use its listed input rate.
Which has the larger context window, Claude 3 Haiku or Claude Sonnet 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
Terminal-Bench 2.0
Claude 3 Haiku—Claude Sonnet 4.550%SourceNot directly comparable
OSWorld-Verified
Claude 3 Haiku—Claude Sonnet 4.561.4%SourceNot directly comparable
VITA-Bench
Claude 3 Haiku—Claude Sonnet 4.517.0%SourceNot directly comparable
Gert Labs
Claude 3 Haiku—Claude Sonnet 4.548.51%SourceNot directly comparable
JobBench
Claude 3 Haiku—Claude Sonnet 4.527.7%SourceNot directly comparable
Coding
SWE-bench Verified
Claude 3 Haiku—Claude Sonnet 4.577.2%SourceNot directly comparable
Reasoning
ARC-AGI-2
Claude 3 Haiku—Claude Sonnet 4.513.6%SourceNot directly comparable
Knowledge
GPQA
Claude 3 Haiku—Claude Sonnet 4.583.4%SourceNot directly comparable
Math
11 public results · 0 shared
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Last updated September 29, 2026