Claude Mythos Preview vs Grok 4.3: price, context and capabilities
A side-by-side comparison of Claude Mythos Preview (Anthropic) and Grok 4.3 (xAI), from the published prices and specifications.
In short
- A price comparison is not possible: one of them has no comparable published price.
- Only Grok 4.3 offers prompt caching.
Specifications side by side
| Claude Mythos Preview | Grok 4.3 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Category | Language models | Language models |
| Status | Deprecated · Limited access | Generally available |
| Headline price | No data | $1.56 / 1M tokens |
| Input | No data | $1.25 / 1M tokens |
| Output | No data | $2.50 / 1M tokens |
| Cached input | No data | $0.20 / 1M tokens |
| Context window | No data | 1M |
| Max output | No data | No data |
| Released | April 2026 | Apr 30, 2026 |
| Knowledge cutoff | No data | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API |
| API model id | claude-mythos-preview | grok-4.3 |
Benchmarks side by side
Leader in bold.
| Benchmark | Claude Mythos Preview | Grok 4.3 |
|---|---|---|
| Intelligence Index | No data | 24.9 |
| Terminal-Bench Hard | No data | 37.9% |
| SciCode | No data | 48.3% |
| GPQA Diamond | No data | 90.1% |
| Humanity's Last Exam | No data | 37.2% |
| IFBench (instruction following) | No data | 81.3% |
| τ²-Bench (agentic tool use) | No data | 97.7% |
| MMMU-Pro (visual reasoning) | No data | 78.1% |
| Long-context reasoning (AA-LCR) | No data | 73% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Which is cheaper, Claude Mythos Preview or Grok 4.3?
A price comparison is not possible: one of them has no comparable published price.
What is the difference between Claude Mythos Preview and Grok 4.3?
Claude Mythos Preview is made by Anthropic and Grok 4.3 by xAI. A price comparison is not possible: one of them has no comparable published price. Only Grok 4.3 offers prompt caching.