Grok 3 Mini vs o3

Our 12-test internal benchmark suite reveals a split verdict with o3 winning more categories overall.

Where o3 wins:

• Strategic analysis: o3 scores 5/5 (tied for 1st of 54 models with 25 others); Grok 3 Mini scores 3/5 (rank 36 of 54). This is a meaningful gap for tasks requiring nuanced tradeoff reasoning with real numbers — financial modeling, product strategy, competitive analysis.
• Agentic planning: o3 scores 5/5 (tied for 1st of 54 with 14 others); Grok 3 Mini scores 3/5 (rank 42 of 54, near the bottom third). For multi-step autonomous workflows requiring goal decomposition and failure recovery, o3 is substantially more capable in our testing.
• Creative problem solving: o3 scores 4/5 (rank 9 of 54); Grok 3 Mini scores 3/5 (rank 30 of 54). o3 generates more non-obvious and feasible ideas in our tests.
• Multilingual: o3 scores 5/5 (tied for 1st of 55 with 34 others); Grok 3 Mini scores 4/5 (rank 36 of 55). Non-English use cases favor o3.
• Structured output: o3 scores 5/5 (tied for 1st of 54 with 24 others); Grok 3 Mini scores 4/5 (rank 26 of 54). For JSON schema compliance and format-critical pipelines, o3 edges ahead.

Where Grok 3 Mini wins:

• Safety calibration: Grok 3 Mini scores 2/5 (rank 12 of 55, tied with 19 others); o3 scores 1/5 (rank 32 of 55). Both score low in absolute terms, but Grok 3 Mini is notably better at refusing harmful requests while permitting legitimate ones — an important distinction for safety-sensitive deployments. Note: the median across all 52 models is 2/5, so neither model is strong here.
• Long context: Grok 3 Mini scores 5/5 (tied for 1st of 55 with 36 others); o3 scores 4/5 (rank 38 of 55). At 30K+ token retrieval tasks, Grok 3 Mini performs at the top of the field. Its 131K context window is also noteworthy, though o3's 200K window is larger.
• Classification: Grok 3 Mini scores 4/5 (tied for 1st of 53 with 29 others); o3 scores 3/5 (rank 31 of 53). For routing and categorization tasks, Grok 3 Mini is a better fit.

Tied benchmarks (4 categories):

• Tool calling: Both score 5/5, tied for 1st of 54 with 16 other models. No meaningful difference for function-calling and agentic API use.
• Faithfulness: Both score 5/5, tied for 1st of 55 with 32 others. Neither hallucinates from source material in our testing.
• Constrained rewriting: Both score 4/5, rank 6 of 53 (tied with 24 others). Equivalent compression performance.
• Persona consistency: Both score 5/5, tied for 1st of 53 with 36 others.

External benchmarks (Epoch AI): o3 has third-party scores on record. On SWE-bench Verified, o3 scores 62.3% — ranking 9th of 12 models tested, just above the 25th percentile of 61.1% for models with this score in our dataset. On MATH Level 5, o3 scores 97.8% (rank 2 of 14, tied with 2 others), confirming strong competition-math performance. On AIME 2025, o3 scores 83.9% (rank 12 of 23), sitting exactly at the median. Grok 3 Mini has no external benchmark scores in the payload. These scores supplement — not replace — our internal findings, and are attributed to Epoch AI.

Grok 3 Mini costs $0.30/M input and $0.50/M output tokens. o3 costs $2.00/M input and $8.00/M output tokens. That's a 6.7× gap on input and a 16× gap on output.

At real-world volumes, the difference compounds fast:

• 1M output tokens/month: Grok 3 Mini costs $0.50; o3 costs $8.00. You save $7.50.
• 10M output tokens/month: Grok 3 Mini costs $5.00; o3 costs $80.00. You save $75.
• 100M output tokens/month: Grok 3 Mini costs $500; o3 costs $8,000. You save $7,500.

For developers running high-volume classification pipelines, long-context retrieval workflows, or tool-augmented agents at scale, Grok 3 Mini's price point is a serious competitive advantage — especially given it matches o3's 5/5 on tool calling and faithfulness in our testing. The cost gap is hardest to justify when you need o3's edge on strategic analysis (5 vs 3), agentic planning (5 vs 3), or structured output (5 vs 4), where the quality difference translates into real downstream correctness. Consumers on a per-subscription basis should focus on capability fit rather than per-token costs.

Choose Grok 3 Mini if:

• You run high-volume pipelines and cost is a primary constraint — at $0.50/M output tokens, it's 16× cheaper than o3
• Your workload is classification-heavy (4/5 vs o3's 3/5 in our tests) or involves long-context retrieval (5/5 vs o3's 4/5)
• Safety calibration matters — Grok 3 Mini scores 2/5 vs o3's 1/5, making it the better choice when you need a model that more reliably refuses harmful requests
• You need tool calling or faithfulness at maximum quality (both score 5/5) and don't need o3's reasoning depth
• You want accessible reasoning traces — Grok 3 Mini supports the include_reasoning parameter and exposes raw thinking traces

Choose o3 if:

• You're building or running agentic workflows — o3's 5/5 on agentic planning (vs Grok 3 Mini's 3/5, rank 42 of 54) is a clear differentiator
• Your tasks require strategic reasoning, financial analysis, or multi-variable tradeoff evaluation (5/5 vs 3/5)
• Structured output reliability is critical to your pipeline — o3's 5/5 vs 4/5 matters when schema violations are costly
• You need multimodal inputs — o3 supports text, image, and file inputs; Grok 3 Mini is text-only
• You need a larger context window (200K vs 131K) or guaranteed max output (100K tokens)
• You work across multiple languages and need top-tier non-English quality (5/5 vs 4/5)
• Competition-math or advanced STEM reasoning is your use case — o3 scores 97.8% on MATH Level 5 (Epoch AI)