Chat turn cost
1K fresh input + 500 output tokens
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.
Confidence: listed-rates
Claude Sonnet 5 vs DeepSeek V4 Flash 0731
Updated September 27, 2026. We do not rank this pair: at least one has no public score. 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
At least one model is not scored in the current public ranking lane, so the page does not name an overall quality winner. 13 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.
- Shared results
- 13
- Claude Sonnet 5 only
- 13
- DeepSeek V4 Flash 0731 only
- 29
- Like-for-like categories
- 0 / 8
Supported: Claude Sonnet 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.
Cache-heavy agent loop cost
200K cached + 20K fresh input + 10K output tokens
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 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
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 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
DeepSeek V4 Flash 0731 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
DeepSeek V4 Flash 0731 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: documented
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.
60.8Claude Sonnet 5—DeepSeek V4 Flash 0731
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.
13 Claude Sonnet 5 only
13 Shared
29 DeepSeek V4 Flash 0731 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.
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.
HLEKnowledge
Normalized gap 22.6Claude Sonnet 5:57.4%DeepSeek V4 Flash 0731:34.8%BrowseCompAgentic
Normalized gap 11.5Claude Sonnet 5:84.7%DeepSeek V4 Flash 0731:73.2%SWE-bench ProCoding
Normalized gap 10.6Claude Sonnet 5:63.2%DeepSeek V4 Flash 0731:52.6%SWE-bench VerifiedCoding
Normalized gap 6.2Claude Sonnet 5:85.2%DeepSeek V4 Flash 0731:79%SWE MultilingualCoding
Normalized gap 5.0Claude Sonnet 5:78.3%DeepSeek V4 Flash 0731:73.3%
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.
Agentic
Not comparable- Claude Sonnet 5
- 64.2
- Supported · #12/105
- DeepSeek V4 Flash 0731
- Not ranked
- Basis
- BenchAlign v5.7 lane · 7 vs 11 public rows
- Reading
- Not comparable
Coding
Not comparable- Claude Sonnet 5
- 60.8
- Supported · #15/135
- DeepSeek V4 Flash 0731
- Not ranked
- Basis
- BenchAlign v5.7 lane · 11 vs 15 public rows
- Reading
- Not comparable
Reasoning
Not comparable- Claude Sonnet 5
- 78.4
- Unranked · 2 rankable rows
- DeepSeek V4 Flash 0731
- 57.0
- Unranked · 4 rankable rows
- Basis
- Provisional lane · 0 vs 1 weighted rows
- Reading
- Not comparable
Multimodal
Not comparable- Claude Sonnet 5
- 77.4
- #15/50
- DeepSeek V4 Flash 0731
- Not ranked
- Basis
- Provisional lane · 1 vs 0 weighted rows
- Reading
- Not comparable
Knowledge
Not comparable- Claude Sonnet 5
- 64.5
- Supported · #23/158
- DeepSeek V4 Flash 0731
- Not ranked
- Basis
- BenchAlign v5.7 lane · 6 vs 8 public rows
- Reading
- Not comparable
Multilingual
Not comparable- Claude Sonnet 5
- Not ranked
- DeepSeek V4 Flash 0731
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Instruction following
Not comparable- Claude Sonnet 5
- Not ranked
- DeepSeek V4 Flash 0731
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Math
Not comparable- Claude Sonnet 5
- Not ranked
- DeepSeek V4 Flash 0731
- 79.9
- Unranked · 4 rankable rows
- Basis
- Provisional lane · 0 vs 1 weighted rows
- Reading
- Not comparable
| Category | Claude Sonnet 5 | DeepSeek V4 Flash 0731 | Basis | Reading |
|---|---|---|---|---|
| Agentic | 64.2Supported · #12/105 | Not ranked | Not comparableBenchAlign v5.7 lane · 7 vs 11 public rows | Not comparable |
| Coding | 60.8Supported · #15/135 | Not ranked | Not comparableBenchAlign v5.7 lane · 11 vs 15 public rows | Not comparable |
| Reasoning | 78.4Unranked · 2 rankable rows | 57.0Unranked · 4 rankable rows | Not comparableProvisional lane · 0 vs 1 weighted rows | Not comparable |
| Multimodal | 77.4#15/50 | Not ranked | Not comparableProvisional lane · 1 vs 0 weighted rows | Not comparable |
| Knowledge | 64.5Supported · #23/158 | Not ranked | Not comparableBenchAlign v5.7 lane · 6 vs 8 public 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 | 79.9Unranked · 4 rankable rows | Not comparableProvisional lane · 0 vs 1 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
- $0.007
- Fits in one request
- DeepSeek V4 Flash 0731
- $0.00028
- Fits in one request
DeepSeek V4 Flash 0731 has the lower modeled cost
Costs use the listed standard API rates.
Repository review
50K fresh input + 3K output tokens
- Claude Sonnet 5
- $0.13
- Fits in one request
- DeepSeek V4 Flash 0731
- $0.00784
- Fits in one request
DeepSeek V4 Flash 0731 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 Sonnet 5
- $0.18
- Fits in one request
- DeepSeek V4 Flash 0731
- $0.00616
- Fits in one request
DeepSeek V4 Flash 0731 has the lower modeled cost
Costs use the listed standard API rates.
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 5DeepSeek V4 Flash 0731
Context window
Maximum documented context; output-token limits may be lower.
Claude Sonnet 5
DeepSeek V4 Flash 0731
API model ID
Claude Sonnet 5
claude-sonnet-5
Anthropic model overviewDeepSeek V4 Flash 0731
deepseek-v4-flash
DeepSeek-V4.1-Flash releaseCached-input rate
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
Claude Sonnet 5
$0.2 per 1M cached input tokens
Claude API pricingDeepSeek V4 Flash 0731
$0.0028 per 1M cached input tokens
Documented inputs
Claude Sonnet 5
text, image
Anthropic model overviewDeepSeek V4 Flash 0731
Documented outputs
Claude Sonnet 5
DeepSeek V4 Flash 0731
Provider availability
Claude Sonnet 5
Generally Available · Claude API
Anthropic model overviewDeepSeek V4 Flash 0731
Deprecated · DeepSeek API
DeepSeek-V4.1-Flash releaseReasoning profile
Claude Sonnet 5
Reasoning
DeepSeek V4 Flash 0731
Reasoning
Weight access
Claude Sonnet 5
Proprietary
DeepSeek V4 Flash 0731
Open Weight
License
Claude Sonnet 5
Proprietary
DeepSeek V4 Flash 0731
Open Weight
Release date
Claude Sonnet 5
2026-06-30
DeepSeek V4 Flash 0731
2026-07-31
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: $0.13 vs $0.00784. Cache-heavy agent loop: $0.18 vs $0.00616.
- 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 or DeepSeek V4 Flash 0731?
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, Claude Sonnet 5 or DeepSeek V4 Flash 0731?
DeepSeek V4 Flash 0731 is not ranked on the public lane for coding, so no winner is named for coding.
Which is better for agentic tasks, Claude Sonnet 5 or DeepSeek V4 Flash 0731?
DeepSeek V4 Flash 0731 is not ranked on the public lane for agentic tasks, so no winner is named for agentic tasks.
Which costs less, Claude Sonnet 5 or DeepSeek V4 Flash 0731?
For the stated presets, chat costs $0.007 on Claude Sonnet 5 and $0.00028 on DeepSeek V4 Flash 0731; repository review costs $0.13 and $0.00784; the cache-heavy agent loop costs $0.18 and $0.00616. Costs use the listed standard API rates.
Which has the larger context window, Claude Sonnet 5 or DeepSeek V4 Flash 0731?
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 evidence55 rows
Agentic
Terminal-Bench 3.0
Claude Sonnet 514.6%SourceDeepSeek V4 Flash 0731—Not directly comparable
Terminal-Bench 2.1
Claude Sonnet 580.4%SourceDeepSeek V4 Flash 073182.7%SourceDeepSeek V4 Flash 0731 leads this result
BrowseComp
Claude Sonnet 584.7%SourceDeepSeek V4 Flash 073173.2%SourceClaude Sonnet 5 leads this result
HLE w/ tools
Claude Sonnet 557.4%SourceDeepSeek V4 Flash 073145.1%SourceClaude Sonnet 5 leads this result
OSWorld-Verified
Claude Sonnet 581.2%SourceDeepSeek V4 Flash 0731—Not directly comparable
Terminal-Bench 2.1 (Vals)
Claude Sonnet 574.5%SourceDeepSeek V4 Flash 073167.0%SourceClaude Sonnet 5 leads this result
ApprenticeBench
Claude Sonnet 516%SourceDeepSeek V4 Flash 0731—Not directly comparable
Terminal-Bench 2.0
Claude Sonnet 5—DeepSeek V4 Flash 073156.9%SourceNot directly comparable
MCP Atlas
Claude Sonnet 5—DeepSeek V4 Flash 073169%SourceNot directly comparable
Toolathlon
Claude Sonnet 5—DeepSeek V4 Flash 073147.8%SourceNot directly comparable
CyberGym
Claude Sonnet 5—DeepSeek V4 Flash 073176.7%SourceNot directly comparable
Toolathlon-Verified
Claude Sonnet 5—DeepSeek V4 Flash 073170.3%SourceNot directly comparable
Agents' Last Exam
Claude Sonnet 5—DeepSeek V4 Flash 073125.2%SourceNot directly comparable
AutomationBench
Claude Sonnet 5—DeepSeek V4 Flash 073125.1%SourceNot directly comparable
Coding
SWE-bench Verified
Claude Sonnet 585.2%SourceDeepSeek V4 Flash 073179%SourceClaude Sonnet 5 leads this result
SWE-bench Pro
Claude Sonnet 563.2%SourceDeepSeek V4 Flash 073152.6%SourceClaude Sonnet 5 leads this result
SWE Multilingual
Claude Sonnet 578.3%SourceDeepSeek V4 Flash 073173.3%SourceClaude Sonnet 5 leads this result
SWE Multimodal
Claude Sonnet 528.1%SourceDeepSeek V4 Flash 0731—Not directly comparable
Terminal-Bench 2.1
Claude Sonnet 580.4%SourceDeepSeek V4 Flash 073182.7%SourceDeepSeek V4 Flash 0731 leads this result
FrontierCode 1.1 Main
Claude Sonnet 542.7%SourceDeepSeek V4 Flash 0731—Not directly comparable
cursorBench32
Claude Sonnet 561.5%SourceDeepSeek V4 Flash 0731—Not directly comparable
VulcanBench CII v1
Claude Sonnet 589.2%SourceDeepSeek V4 Flash 0731—Not directly comparable
LiveCodeBench (Vals)
Claude Sonnet 582.4%SourceDeepSeek V4 Flash 073187.3%SourceDeepSeek V4 Flash 0731 leads this result
SWE-bench (Vals)
Claude Sonnet 579.6%SourceDeepSeek V4 Flash 073188.8%SourceDeepSeek V4 Flash 0731 leads this result
cursorBench40
Claude Sonnet 534.1%SourceDeepSeek V4 Flash 0731—Not directly comparable
LiveCodeBench Pass@1-COT
Claude Sonnet 5—DeepSeek V4 Flash 073191.6%SourceNot directly comparable
Codeforces
Claude Sonnet 5—DeepSeek V4 Flash 07313052.0SourceNot directly comparable
Terminal-Bench 2.0
Claude Sonnet 5—DeepSeek V4 Flash 073156.9%SourceNot directly comparable
NL2Repo
Claude Sonnet 5—DeepSeek V4 Flash 073154.2%SourceNot directly comparable
DeepSWE
Claude Sonnet 5—DeepSeek V4 Flash 073154.4%SourceNot directly comparable
DSBench-FullStack
Claude Sonnet 5—DeepSeek V4 Flash 073168.7%SourceNot directly comparable
DSBench-Hard
Claude Sonnet 5—DeepSeek V4 Flash 073159.6%SourceNot directly comparable
VulcanBench v3
Claude Sonnet 5—DeepSeek V4 Flash 073188.4%SourceNot directly comparable
OpenHarmony Bench
Claude Sonnet 5—DeepSeek V4 Flash 073153.8%SourceNot directly comparable
Reasoning
MRCR 1M
Claude Sonnet 5—DeepSeek V4 Flash 073178.7%SourceNot directly comparable
CorpusQA 1M
Claude Sonnet 5—DeepSeek V4 Flash 073160.5%SourceNot directly comparable
ARC-AGI-1
Claude Sonnet 5—DeepSeek V4 Flash 073189.00%SourceNot directly comparable
ARC-AGI-2
Claude Sonnet 5—DeepSeek V4 Flash 073161.4%SourceNot directly comparable
Multimodal
Knowledge
HLE
Claude Sonnet 557.4%SourceDeepSeek V4 Flash 073134.8%SourceClaude Sonnet 5 leads this result
HLE w/o tools
Claude Sonnet 543.2%SourceDeepSeek V4 Flash 0731—Not directly comparable
HLE-Verified
Claude Sonnet 531.0%SourceDeepSeek V4 Flash 0731—Not directly comparable
LABBench2
Claude Sonnet 580.1%SourceDeepSeek V4 Flash 0731—Not directly comparable
GPQA Diamond (Vals)
Claude Sonnet 588.9%SourceDeepSeek V4 Flash 073189.9%SourceDeepSeek V4 Flash 0731 leads this result
MMLU-Pro (Vals)
Claude Sonnet 587.5%SourceDeepSeek V4 Flash 073186.2%SourceClaude Sonnet 5 leads this result
MMLU-Pro
Claude Sonnet 5—DeepSeek V4 Flash 073186.2%SourceNot directly comparable
SimpleQA
Claude Sonnet 5—DeepSeek V4 Flash 073134.1%SourceNot directly comparable
Chinese-SimpleQA
Claude Sonnet 5—DeepSeek V4 Flash 073178.9%SourceNot directly comparable
GPQA
Claude Sonnet 5—DeepSeek V4 Flash 073188.1%SourceNot directly comparable
GPQA-D
Claude Sonnet 5—DeepSeek V4 Flash 073188.1%SourceNot directly comparable
Math
HMMT Feb 2026
Claude Sonnet 5—DeepSeek V4 Flash 073194.8%SourceNot directly comparable
IMOAnswerBench
Claude Sonnet 5—DeepSeek V4 Flash 073188.4%SourceNot directly comparable
Apex
Claude Sonnet 5—DeepSeek V4 Flash 073133.0%SourceNot directly comparable
Apex Shortlist
Claude Sonnet 5—DeepSeek V4 Flash 073185.7%SourceNot directly comparable
55 public results · 13 shared
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Last updated September 27, 2026