Trial
Grok 4.2 is xAI's February 2026 flagship — currently leading SWE-bench Verified at 75% and introducing a built-in multi-agent collaboration system where four specialized agents tackle complex problems in parallel. Worth evaluating for coding-heavy use cases, particularly where real-time web access matters.
Why It's in Trial
Grok 4.2 earns serious attention from benchmarks alone — its 75% SWE-bench score edges out GPT-5.4 (74.9%) and Claude Opus 4.6 (74%). But xAI's enterprise ecosystem, compliance story, and long-term support track record are less established than Anthropic or OpenAI, which keeps it in Trial rather than Adopt.
Key capabilities:
- SWE-bench Verified: 75% — highest published score at time of writing
- ~1 trillion parameters with a 256K context window
- 4 Agents multi-agent system: Grok 4.20 introduced four specialized sub-agents working in parallel on complex tasks — an architectural analog to Grok 4 Heavy's multi-agent reasoning
- Real-time X/Twitter data: Uniquely integrates live social/news signals that other models lack
- AIME 2026: Near-perfect performance on advanced math reasoning
Grok 4 Heavy vs 4.2
xAI maintains two tracks:
- Grok 4.2: Standard model, optimized for coding and long-horizon tasks
- Grok 4 Heavy ($300/month): Spins up multiple agent instances in parallel on the same task, compares outputs, and converges — best for complex reasoning where getting it right matters more than cost
When to Choose Grok Over Claude or GPT
Grok's differentiated strengths:
- Leading SWE-bench — for pure agentic coding benchmarks, it's currently #1
- Real-time web data — for agents that need current information, not just training data
- Math and reasoning — AIME 100% (Grok 4), GPQA 87%
Access & Pricing
| Tier | Cost | Access |
|---|---|---|
| SuperGrok | $30/month | Grok 4.2 |
| X Premium+ | $40/month | Grok 4.2 |
| SuperGrok Heavy | $300/month | Grok 4 Heavy (multi-agent) |
| xAI API | Pay-per-use | Available for developers |
Key Characteristics
| Property | Value |
|---|---|
| Parameters | ~1 trillion |
| Context window | 256,000 tokens |
| SWE-bench Verified | 75% |
| GPQA Diamond | 87% |
| Provider | xAI |
| Release date | February 17, 2026 |