Quick Take

Released in late April 2026, Grok 4.3 (medium) by xAI and MiMo-V2.5 by Xiaomi offer distinct trade-offs. Grok 4.3 positions itself as a high-intelligence model, whereas MiMo-V2.5 focuses on developer-centric utility and operational efficiency.

Benchmark Read

In terms of general intelligence, the models are closely matched, with MiMo-V2.5 scoring 49.0 compared to Grok 4.3’s 48.8. However, their strengths diverge in specific domains:

• Coding: MiMo-V2.5 significantly outperforms with a coding index of 42.1 versus Grok 4.3’s 35.1.
• Reasoning: Grok 4.3 shows strength in GPQA (0.89 vs 0.849) and IFBench (0.833 vs 0.671).
• Technical Proficiency: MiMo-V2.5 excels in TerminalBench Hard (0.417 vs 0.303), suggesting better handling of complex command-line or system-level tasks.
• Math: Both models currently report unknown math index scores.

Cost and Speed

MiMo-V2.5 is the clear winner for cost-sensitive deployments. Its blended pricing of $0.72/1M tokens is substantially lower than Grok 4.3’s $1.56/1M. Furthermore, MiMo-V2.5 demonstrates a superior time to first token (2.562s) compared to Grok 4.3 (30.395s), making it more suitable for real-time interactive applications. Grok 4.3 maintains a higher output speed at 106.798 tok/s compared to MiMo-V2.5’s 93.859 tok/s.

Best Fit

• Grok 4.3 (medium): Best suited for complex reasoning tasks, research-heavy workflows, and scenarios where the highest possible intelligence index is required for non-coding applications.
• MiMo-V2.5: Ideal for software development environments, high-frequency API integrations, and applications where low latency and cost-per-token are critical business drivers.