Agentic
Not comparable- Claude Mythos 5
- Not ranked
- DeepSeek V3
- 38.5
- Estimated · #124/151
- Basis
- BenchAlign lane · 4 vs 0 public rows
- Reading
- Not comparable
Claude Mythos 5 vs DeepSeek V3
Updated September 4, 2026. Public scores include evidence status and uncertainty. They are not guarantees for a specific workload.
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.
2 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.
Share or export
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
Claude Mythos 5
Claude Mythos 5 has the larger documented context window.
Confidence: documented
Chat turn cost
1K fresh input + 500 output tokens
DeepSeek V3
DeepSeek V3 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 V3
DeepSeek V3 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
Claude Mythos 5 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
Claude Mythos 5 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. DeepSeek V3 does not fit this workload in one request.
Confidence: listed-rates
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 Mythos 5 only
2 Shared
4 DeepSeek V3 only
- Shared results
- 2
- Claude Mythos 5 only
- 13
- DeepSeek V3 only
- 4
- Like-for-like categories
- 0 / 8
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.
Coding
Not comparable- Claude Mythos 5
- Not ranked
- DeepSeek V3
- 41.1
- Estimated · #135/183
- Basis
- BenchAlign lane · 3 vs 2 public rows
- Reading
- Not comparable
Reasoning
Not comparable- Claude Mythos 5
- Not ranked
- DeepSeek V3
- 43.8
- Unranked · 2 rankable rows
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Knowledge
Not comparable- Claude Mythos 5
- Not ranked
- DeepSeek V3
- 40.7
- Estimated · #136/181
- Basis
- BenchAlign lane · 3 vs 2 public rows
- Reading
- Not comparable
Math
Not comparable- Claude Mythos 5
- Not ranked
- DeepSeek V3
- 26.2
- Unranked · 1 rankable row
- Basis
- Provisional lane · 1 vs 1 weighted rows
- Reading
- Not comparable
Multilingual
Not comparable- Claude Mythos 5
- Not ranked
- DeepSeek V3
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Multimodal
Not comparable- Claude Mythos 5
- 85.1
- Unranked · 3 rankable rows
- DeepSeek V3
- Not ranked
- Basis
- Provisional lane · 1 vs 0 weighted rows
- Reading
- Not comparable
Instruction following
Not comparable- Claude Mythos 5
- Not ranked
- DeepSeek V3
- 39.6
- #102/120
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
| Category | Claude Mythos 5 | DeepSeek V3 | Basis | Reading |
|---|---|---|---|---|
| Agentic | Not ranked | 38.5Estimated · #124/151 | Not comparableBenchAlign lane · 4 vs 0 public rows | Not comparable |
| Coding | Not ranked | 41.1Estimated · #135/183 | Not comparableBenchAlign lane · 3 vs 2 public rows | Not comparable |
| Reasoning | Not ranked | 43.8Unranked · 2 rankable rows | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Knowledge | Not ranked | 40.7Estimated · #136/181 | Not comparableBenchAlign lane · 3 vs 2 public rows | Not comparable |
| Math | Not ranked | 26.2Unranked · 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 |
| Multimodal | 85.1Unranked · 3 rankable rows | Not ranked | Not comparableProvisional lane · 1 vs 0 weighted rows | Not comparable |
| Instruction following | Not ranked | 39.6#102/120 | 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) 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.
SWE-bench Verified
Coding
GPQA
Knowledge
Claude Mythos 5: 94.1%DeepSeek V3: 59.1%Normalized gap 35.0Claude Mythos 5 source DeepSeek V3 source
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 Mythos 5
- $0.035
- Fits in one request
- DeepSeek V3
- $0.00082
- Fits in one request
DeepSeek V3 has the lower modeled cost
Costs use the listed standard API rates.
Repository review
50K fresh input + 3K output tokens
- Claude Mythos 5
- $0.65
- Fits in one request
- DeepSeek V3
- $0.0168
- Fits in one request
DeepSeek V3 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 Mythos 5
- $0.9
- Fits in one request
- DeepSeek V3
- $0.0304
- Does not fit in one request
DeepSeek V3 does not fit this workload in one request.
Specification differences
Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.
SpecificationClaude Mythos 5DeepSeek V3
Context window
Maximum documented context; output-token limits may be lower.
Claude Mythos 5
DeepSeek V3
128K
API model ID
Claude Mythos 5
claude-mythos-5
Anthropic model overviewDeepSeek V3
Not sourced
Cached-input rate
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
Claude Mythos 5
$1 per 1M cached input tokens
Claude API pricingDeepSeek V3
$0.07 per 1M cached input tokens
Documented inputs
Claude Mythos 5
text, image
Anthropic model overviewDeepSeek V3
Not sourced
Documented outputs
Claude Mythos 5
DeepSeek V3
Not sourced
Provider availability
Claude Mythos 5
Limited Access · Claude API
Anthropic model overviewDeepSeek V3
Not sourced
Reasoning profile
Claude Mythos 5
Reasoning
DeepSeek V3
Non-Reasoning
Weight access
Claude Mythos 5
Proprietary
DeepSeek V3
Open Weight
License
Claude Mythos 5
Proprietary
DeepSeek V3
Open Weight
Release date
Claude Mythos 5
2026-06-09
DeepSeek V3
2024-12-26
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: $0.65 vs $0.0168. Cache-heavy agent loop: $0.9 vs $0.0304.
- Context tradeoff
- Claude Mythos 5 has the larger documented window (1M).
Run the same representative tasks against both endpoints before changing production traffic.
Self-host vs API cost
Estimates at 50,000 req/day · 1000 tokens/req average.
Claude Mythos 5
API / mo$45,000
Self-host / moNot listed
Break-even—
Proprietary model — self-hosting not applicable.
DeepSeek V3
API / mo$1,028
Self-host / mo$18,221
Break-even1.2B/day
Benchmark evidence
The full public result ledger is available for audit without forcing a wide desktop table onto a phone.
Browse raw public benchmark evidence19 rows
Agentic
Coding
SWE-bench Verified
Claude Mythos 595.5%SourceDeepSeek V342%SourceClaude Mythos 5 leads this result
SWE-bench Pro
Claude Mythos 580.3%SourceDeepSeek V3—Not directly comparable
Terminal-Bench 2.0
Claude Mythos 588.0%SourceDeepSeek V3—Not directly comparable
LiveCodeBench
Claude Mythos 5—DeepSeek V337.6%SourceNot directly comparable
Knowledge
Math
Multilingual
SWE Multilingual
Claude Mythos 592.2%SourceDeepSeek V3—Not directly comparable
Multimodal
Instruction following
IFEval
Claude Mythos 5—DeepSeek V386.1%SourceNot directly comparable
Frequently asked questions
Which is better, Claude Mythos 5 or DeepSeek V3?
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 Mythos 5 or DeepSeek V3?
Claude Mythos 5 is not ranked on the public lane for coding, so no winner is named for coding.
Which is better for agentic tasks, Claude Mythos 5 or DeepSeek V3?
Claude Mythos 5 is not ranked on the public lane for agentic tasks, so no winner is named for agentic tasks.
Which costs less, Claude Mythos 5 or DeepSeek V3?
For the stated presets, chat costs $0.035 on Claude Mythos 5 and $0.00082 on DeepSeek V3; repository review costs $0.65 and $0.0168; the cache-heavy agent loop costs $0.9 and $0.0304. DeepSeek V3 does not fit this workload in one request.
Which has the larger context window, Claude Mythos 5 or DeepSeek V3?
Claude Mythos 5 has the larger documented context window: 1M, compared with 128K.
Related comparisons
Last updated September 4, 2026
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