Agentic
Not comparable- Claude Mythos Preview
- Not measured
- Claude Sonnet 5
- 81.9
- Weighted basis
- 0 vs 3 rows
- Reading
- Not comparable
Claude Mythos Preview vs Claude Sonnet 5
Updated August 13, 2026. Public scores include evidence status and uncertainty. They are not guarantees for a specific workload.
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 based on different benchmark sets are marked directional and do not name a winner.
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.
Chat turn cost
1K fresh input + 500 output tokens
Claude Sonnet 5
Claude Sonnet 5 has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.
Confidence: listed-rates
Cache-heavy agent loop cost
200K cached + 20K fresh input + 10K output tokens
Claude Sonnet 5
Claude Sonnet 5 has the lower estimated token cost for this stated workload. Claude Mythos Preview has no published cached-input rate, so cached tokens use its listed input rate.
Confidence: rate-fallback
Show secondary and unsupported calls
Repository review cost
50K fresh input + 3K output tokens
Claude Sonnet 5
Claude Sonnet 5 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
No shared weighted benchmark basis supports a winner.
Confidence: limited
Agentic work
Tool use, computer use, and multi-step task completion
Not enough matched evidence
No shared weighted benchmark basis supports a winner.
Confidence: limited
Long documents
Prompts that approach the documented context limit
Not enough matched evidence
A complete context comparison is not sourced.
Confidence: limited
What is actually comparable
Shared results can support a head-to-head reading. Results present for only one model describe coverage, not superiority.
2 Claude Mythos Preview only
19 Claude Sonnet 5 only
- Shared results
- 0
- Claude Mythos Preview only
- 2
- Claude Sonnet 5 only
- 19
- Like-for-like categories
- 0 / 8
Category results, on a stated basis
Each row states whether both averages use the same weighted benchmark set. Directional and not-comparable rows remain visible, but they never receive a winner in this template.
Coding
Not comparable- Claude Mythos Preview
- Not measured
- Claude Sonnet 5
- 76.7
- Weighted basis
- 0 vs 2 rows
- Reading
- Not comparable
Reasoning
Not comparable- Claude Mythos Preview
- Not measured
- Claude Sonnet 5
- Not measured
- Weighted basis
- 0 vs 0 rows
- Reading
- Not comparable
Knowledge
Not comparable- Claude Mythos Preview
- Not measured
- Claude Sonnet 5
- 57.4
- Weighted basis
- 0 vs 1 rows
- Reading
- Not comparable
Math
Not comparable- Claude Mythos Preview
- Not measured
- Claude Sonnet 5
- Not measured
- Weighted basis
- 0 vs 0 rows
- Reading
- Not comparable
Multilingual
Not comparable- Claude Mythos Preview
- Not measured
- Claude Sonnet 5
- Not measured
- Weighted basis
- 0 vs 0 rows
- Reading
- Not comparable
Multimodal
Not comparable- Claude Mythos Preview
- Not measured
- Claude Sonnet 5
- 88.3
- Weighted basis
- 0 vs 1 rows
- Reading
- Not comparable
Instruction following
Not comparable- Claude Mythos Preview
- Not measured
- Claude Sonnet 5
- Not measured
- Weighted basis
- 0 vs 0 rows
- Reading
- Not comparable
| Category | Claude Mythos Preview | Claude Sonnet 5 | Weighted basis | Reading |
|---|---|---|---|---|
| Agentic | Not measured | 81.9 | Not comparable0 vs 3 rows | Not comparable |
| Coding | Not measured | 76.7 | Not comparable0 vs 2 rows | Not comparable |
| Reasoning | Not measured | Not measured | Not comparable0 vs 0 rows | Not comparable |
| Knowledge | Not measured | 57.4 | Not comparable0 vs 1 rows | Not comparable |
| Math | Not measured | Not measured | Not comparable0 vs 0 rows | Not comparable |
| Multilingual | Not measured | Not measured | Not comparable0 vs 0 rows | Not comparable |
| Multimodal | Not measured | 88.3 | Not comparable0 vs 1 rows | Not comparable |
| Instruction following | Not measured | Not measured | Not comparable0 vs 0 rows | Not comparable |
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.
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 Preview
- $0.0875
- Fit state unavailable
- Claude Sonnet 5
- $0.007
- Fits in one request
Claude Sonnet 5 has the lower modeled cost
Costs use the listed standard API rates.
Repository review
50K fresh input + 3K output tokens
- Claude Mythos Preview
- $1.63
- Fit state unavailable
- Claude Sonnet 5
- $0.13
- Fits in one request
Claude Sonnet 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 Mythos Preview
- $6.75
- Fit state unavailable
- Cached input priced at the published list-input rate
- Claude Sonnet 5
- $0.18
- Fits in one request
Claude Sonnet 5 has the lower modeled cost
Claude Mythos Preview has no published cached-input rate, so cached tokens use its listed input rate.
Specification differences
Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.
SpecificationClaude Mythos PreviewClaude Sonnet 5
Context window
Maximum documented context; output-token limits may be lower.
Claude Mythos Preview
Not sourced
Claude Sonnet 5
API model ID
Claude Mythos Preview
claude-mythos-preview
Anthropic Project GlasswingClaude Sonnet 5
claude-sonnet-5
Anthropic model overviewCached-input rate
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
Claude Mythos Preview
Not published
Anthropic Project GlasswingClaude Sonnet 5
$0.2 per 1M cached input tokens
Claude API pricingDocumented inputs
Claude Mythos Preview
Not sourced
Claude Sonnet 5
text, image
Anthropic model overviewDocumented outputs
Claude Mythos Preview
Not sourced
Claude Sonnet 5
Provider availability
Claude Mythos Preview
Not sourced
Claude Sonnet 5
Generally Available · Claude API
Anthropic model overviewReasoning profile
Claude Mythos Preview
Reasoning
Claude Sonnet 5
Reasoning
Weight access
Claude Mythos Preview
Proprietary
Claude Sonnet 5
Proprietary
License
Claude Mythos Preview
Proprietary
Claude Sonnet 5
Proprietary
Release date
Claude Mythos Preview
2026-04-07
Claude Sonnet 5
2026-06-30
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: $1.63 vs $0.13. Cache-heavy agent loop: $6.75 vs $0.18.
- Context tradeoff
- A complete documented context comparison is not available.
Run the same representative tasks against both endpoints before changing production traffic.
Benchmark evidence
The full public result ledger is available for audit without forcing a wide desktop table onto a phone.
Browse raw public benchmark evidence21 rows
Agentic
CyberGym
Claude Mythos Preview83.1%SourceClaude Sonnet 5—Not directly comparable
ExploitGym
Claude Mythos Preview17.5%SourceClaude Sonnet 5—Not directly comparable
Terminal-Bench 3.0
Claude Mythos Preview—Claude Sonnet 514.6%SourceNot directly comparable
Terminal-Bench 2.0
Claude Mythos Preview—Claude Sonnet 580.4%SourceNot directly comparable
BrowseComp
Claude Mythos Preview—Claude Sonnet 584.7%SourceNot directly comparable
HLE w/ tools
Claude Mythos Preview—Claude Sonnet 557.4%SourceNot directly comparable
OSWorld-Verified
Claude Mythos Preview—Claude Sonnet 581.2%SourceNot directly comparable
Coding
SWE-bench Verified
Claude Mythos Preview—Claude Sonnet 585.2%SourceNot directly comparable
SWE-bench Pro
Claude Mythos Preview—Claude Sonnet 563.2%SourceNot directly comparable
SWE Multilingual
Claude Mythos Preview—Claude Sonnet 578.3%SourceNot directly comparable
SWE Multimodal
Claude Mythos Preview—Claude Sonnet 528.1%SourceNot directly comparable
Terminal-Bench 2.0
Claude Mythos Preview—Claude Sonnet 580.4%SourceNot directly comparable
FrontierCode 1.1 Main
Claude Mythos Preview—Claude Sonnet 542.7%SourceNot directly comparable
cursorBench32
Claude Mythos Preview—Claude Sonnet 561.5%SourceNot directly comparable
APEX-SWE
Claude Mythos Preview—Claude Sonnet 546.4%SourceNot directly comparable
EEBench
Claude Mythos Preview—Claude Sonnet 540.3%SourceNot directly comparable
3DCodeBench
Claude Mythos Preview—Claude Sonnet 539.2%SourceNot directly comparable
Knowledge
Multimodal
Frequently asked questions
Which is better, Claude Mythos Preview or Claude Sonnet 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 Mythos Preview or Claude Sonnet 5?
The published evidence does not provide a shared weighted coding basis for both models, so BenchLM does not name a coding winner.
Which is better for agentic tasks, Claude Mythos Preview or Claude Sonnet 5?
The published evidence does not provide a shared weighted agentic tasks basis for both models, so BenchLM does not name a agentic tasks winner.
Which costs less, Claude Mythos Preview or Claude Sonnet 5?
For the stated presets, chat costs $0.0875 on Claude Mythos Preview and $0.007 on Claude Sonnet 5; repository review costs $1.63 and $0.13; the cache-heavy agent loop costs $6.75 and $0.18. Claude Mythos Preview has no published cached-input rate, so cached tokens use its listed input rate.
Which has the larger context window, Claude Mythos Preview or Claude Sonnet 5?
A complete documented context-window comparison is not available.
Related comparisons
Last updated August 13, 2026
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