MiniMax M2 / M2.5 vs Grok Speech (STT + TTS APIs)
Which one should you pick? Here's the full breakdown.
MiniMax M2 / M2.5
MiniMax's open-weights frontier -- first open model to match Claude Opus 4.6 on SWE-Bench at 10-20× lower cost
Grok Speech (STT + TTS APIs)
xAI's standalone voice APIs -- launched 2026-04-17. Built on the stack that powers Grok Voice, Tesla vehicles, and Starlink customer support. $0.10/hr STT batch, $4.20 per 1M characters TTS, 25+ languages, word-level timestamps + speaker diarization
| Category | MiniMax M2 / M2.5 | Grok Speech (STT + TTS APIs) |
|---|---|---|
| Ease of Use | 6.5 | 7.0 |
| Output Quality | 9.0 | 8.5 |
| Value | 9.5 | 9.0 |
| Features | 8.5 | 8.0 |
| Overall | 8.4 | 8.1 |
Pricing Comparison
| Feature | MiniMax M2 / M2.5 | Grok Speech (STT + TTS APIs) |
|---|---|---|
| Free Tier | Yes | No |
| Starting Price | $0 | $0.10 |
Benchmark Head-to-Head
MiniMax M2.5 (230B/10B active MoE) benchmarks — Grok Speech (STT + TTS APIs) has no published benchmarks
| Benchmark | Description | Score |
|---|---|---|
| MMLU-Pro | Harder multi-subject reasoning | 82.1% |
| GPQA Diamond | Graduate-level science questions | 76.8% |
| SWE-Bench Verified | 80.2% | |
| HumanEval | Python code generation | 91% |
| AIME 2025 | 85.3% |
Which Should You Pick?
Pick MiniMax M2 / M2.5 if...
- ✓Has a free tier
Agentic coding and tool-use workflows on a budget. Best price-to-SWE-Bench ratio of any open-weights model in 2026.
Visit MiniMax M2 / M2.5Pick Grok Speech (STT + TTS APIs) if...
Developers building voice agents, real-time transcription tools, accessibility features, or high-volume TTS workloads where the cost per hour of audio actually matters at scale. Strong fit for phone-call and meeting transcription use cases where xAI's published WER advantage (5.0% on phone-call entities vs. ElevenLabs 12.0%) compounds quickly.
Visit Grok Speech (STT + TTS APIs)Our Verdict
MiniMax M2 / M2.5 edges out Grok Speech (STT + TTS APIs) with a 8.4 vs 8.1 overall score. Both are solid picks, but MiniMax M2 / M2.5 has the advantage in output quality.