Claude Mythos 5 vs Grok 4.5
Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Verdict
Claude Mythos 5 leads for most workloads.
- Grok 4.5 is ~5× cheaper on input tokens — the budget pick.
Based on BenchLM composite scores, July 2026.
Claude Mythos 5
90
Grok 4.5
75
Verified leaderboard positions: Claude Mythos 5 #1 · Grok 4.5 unranked
Pick Claude Mythos 5 if you want the stronger benchmark profile. Grok 4.5 only becomes the better choice if you want the cheaper token bill.
Category Radar
Head-to-Head by Category
Category Breakdown
| Benchmark | Claude Mythos 5 | Δ | Grok 4.5 |
|---|---|---|---|
| Coding | 86.0 | ← 21.3 | 64.7 |
| Agentic | 87.0 | ← 3.7 | 83.3 |
| Knowledge | 68.5 | — | — |
| Math | 97.6 | — | — |
| Multimodal | 93.0 | — | — |
Operational Comparison
Claude Mythos 5
Grok 4.5
$10 / $50
$2 / $6
N/A
N/A
N/A
N/A
1M+
500K
Quick Verdict
Pick Claude Mythos 5 if you want the stronger benchmark profile. Grok 4.5 only becomes the better choice if you want the cheaper token bill.
Claude Mythos 5 is clearly ahead on the provisional aggregate, 90 to 75. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Mythos 5's sharpest advantage is in coding, where it averages 86 against 64.7. The single biggest benchmark swing on the page is SWE-bench Pro, 80.3% to 64.7%.
Claude Mythos 5 is also the more expensive model on tokens at $10.00 input / $50.00 output per 1M tokens, versus $2.00 input / $6.00 output per 1M tokens for Grok 4.5. That is roughly 8.3x on output cost alone. Claude Mythos 5 gives you the larger context window at 1M+, compared with 500K for Grok 4.5.
Benchmark Deep Dive
Frequently Asked Questions (3)
Which is better, Claude Mythos 5 or Grok 4.5?
Claude Mythos 5 is ahead on BenchLM's provisional leaderboard, 90 to 75. The biggest single separator in this matchup is SWE-bench Pro, where the scores are 80.3% and 64.7%.
Which is better for coding, Claude Mythos 5 or Grok 4.5?
Claude Mythos 5 has the edge for coding in this comparison, averaging 86 versus 64.7. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, Claude Mythos 5 or Grok 4.5?
Claude Mythos 5 has the edge for agentic tasks in this comparison, averaging 87 versus 83.3. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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