CL-SN55 941 —
GPT-56T 861 —
GPT-6S 837 —
GPT-56SC 837 +8.6%
CL-OP55X 831 +8.8%
GROK-46H 831 +8.8%
DSK-V4PH 831 +8.8%
GLM-52 822 +3.9%
GPT-61S 818 —
MUSE-SPK 804 -3.9%
CL-FAB5H 749 +9.8%
GLM-5 749 -3.9%
CL-OP5H 724 +10.2%
CL-OP5X 722 +10.2%
QWEN-38X 722 -3.9%
GEM-37FH 720 +10.3%
KIMI-K3X 718 -3.6%
CL-OP46H 707 +10.5%
CL-OP55H 705 +10.5%
GPT-6A 704 -5.1%
CL-OP47H 696 +10.7%
GEM-38FH 687 -3.5%
GEM-36FH 647 +11.6%
CL-OP48H 644 +11.6%
GEM-35FH 630 +11.9%
GPT-55H 588 +12.6%
GPT-56S 586 -0.5%
CL-OP47 550 -0.5%
INKL 531 —
GEM-3P 495 —
CL-OP46 491 -0.2%
GEM-31P 489 -2%
CL-OP48 485 —
GPT-6L 436 —
GPT-55 398 -2%
CL-SN55 941 —
GPT-56T 861 —
GPT-6S 837 —
GPT-56SC 837 +8.6%
CL-OP55X 831 +8.8%
GROK-46H 831 +8.8%
DSK-V4PH 831 +8.8%
GLM-52 822 +3.9%
GPT-61S 818 —
MUSE-SPK 804 -3.9%
CL-FAB5H 749 +9.8%
GLM-5 749 -3.9%
CL-OP5H 724 +10.2%
CL-OP5X 722 +10.2%
QWEN-38X 722 -3.9%
GEM-37FH 720 +10.3%
KIMI-K3X 718 -3.6%
CL-OP46H 707 +10.5%
CL-OP55H 705 +10.5%
GPT-6A 704 -5.1%
CL-OP47H 696 +10.7%
GEM-38FH 687 -3.5%
GEM-36FH 647 +11.6%
CL-OP48H 644 +11.6%
GEM-35FH 630 +11.9%
GPT-55H 588 +12.6%
GPT-56S 586 -0.5%
CL-OP47 550 -0.5%
INKL 531 —
GEM-3P 495 —
CL-OP46 491 -0.2%
GEM-31P 489 -2%
CL-OP48 485 —
GPT-6L 436 —
GPT-55 398 -2%
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Anthropic's Claude Mythos Preview Posts 93.9% on SWE-Bench Verified — a Generation Ahead of Opus 4.6

Anthropic has shared benchmark results for Claude Mythos Preview — an unreleased frontier model at the center of Project Glasswing, the company’s cybersecurity initiative. The numbers suggest a meaningful capability step over the current public generation.

Coding: The Numbers

BenchmarkMythos PreviewOpus 4.6Gap
SWE-bench Pro77.8%53.4%+24.4 pts
SWE-bench Verified93.9%80.8%+13.1 pts
SWE-bench Multilingual87.3%77.8%+9.5 pts
Terminal-Bench 2.082.0%65.4%+16.6 pts
SWE-bench Multimodal59.0%27.1%+31.9 pts

The SWE-bench Multimodal result is the most striking — Mythos scores more than double Opus 4.6 on a benchmark that tests AI ability to understand visual context in code (UI screenshots, diagrams, visual debugging).

When Gemini 3.1 Pro launched, GPT-5.3-Codex led SWE-bench Pro at 56.8%. Mythos Preview exceeds that by more than 21 points.

Reasoning

On GPQA Diamond — graduate-level science questions in physics, chemistry, and biology — Mythos Preview scores 94.6% versus 91.3% for Opus 4.6. The delta is smaller than on coding, but GPQA Diamond has been one of the harder benchmarks to move significantly.

Context

Mythos Preview is tied to Project Glasswing, Anthropic’s cybersecurity-focused initiative. The model is not publicly available. Anthropic has not announced pricing or a release timeline. These results are internal benchmarks shared by Anthropic — independent verification has not yet been published.