Is OpenAI o3-mini better than Mistral Small 3 for coding?

OpenAI o3-mini scores 80 overall vs Mistral Small 3's 42. OpenAI o3-mini has stronger benchmark performance, but pricing also matters — OpenAI o3-mini costs $1.10/M input vs $0.100/M for Mistral Small 3.

Which is cheaper: OpenAI o3-mini or Mistral Small 3?

Mistral Small 3 is cheaper per million input tokens at $0.10/M vs $1.10/M.

What is the price-performance ratio of OpenAI o3-mini vs Mistral Small 3?

Based on benchmark scores, OpenAI o3-mini costs $0.014 per score point while Mistral Small 3 costs $0.002 per score point. Mistral Small 3 offers better value.

OpenAI o3-mini vs Mistral Small 3

Performance benchmarks + pricing comparison — updated April 2026

OpenAI o3-mini

OpenAI

Affordable reasoning model for coding tasks. Best price-performance for algorithm-heavy work.

Input	$1.10/M
Output	$4.40/M
Context	200K tokens
Best For	Algorithm design, coding challenges, debugging
Benchmark	80/100

Mistral Small 3

Mistral

Mistral's cost-effective model. Very affordable for general-purpose tasks.

Input	$0.100/M
Output	$0.300/M
Context	32K tokens
Best For	High-volume tasks, cost optimization
Benchmark	42/100

Benchmark Performance Comparison

Third-party benchmark scores — higher is better. Data sourced from SWE-bench, LiveCodeBench, HumanEval, and BigCodeBench.

Benchmark	OpenAI o3-mini	Mistral Small 3	Leader
Overall Score	80	42	o3-mini leads by 38pts
SWE-bench Verified	76	35	o3-mini leads by 41pts
LiveCodeBench	85	44	o3-mini leads by 41pts
HumanEval	94	65	o3-mini leads by 29pts
BigCodeBench	65	28	o3-mini leads by 37pts

Cost Comparison by Scenario

Estimated cost per project with 30% cache hit rate. Actual costs may vary based on usage patterns.

Scenario	OpenAI o3-mini	Mistral Small 3	Savings
Small Script (1K lines)	$0.17	$0.01	Mistral Small 3 saves $0.16 (93%)
Medium Feature (10K lines)	$1.27	$0.10	Mistral Small 3 saves $1.17 (92%)
Large Project (50K lines)	$6.33	$0.47	Mistral Small 3 saves $5.85 (92%)
Code Review (5K lines)	$0.30	$0.02	Mistral Small 3 saves $0.28 (92%)

Value Analysis (Price per Benchmark Score Point)

Lower is better — how much you pay for each point of benchmark performance.

Model	Overall Score	Price per Score Point	Verdict
OpenAI o3-mini	80	$0.014/pt	Higher cost per point
Mistral Small 3	42	$0.002/pt	Better value

Mistral Small 3 delivers the best value at $0.002 per score point.

Strengths & Weaknesses

OpenAI o3-mini

+ Excellent at competitive programming
+ Strong algorithmic reasoning
- Optimized for reasoning, not chat

Mistral Small 3

+ Ultra-cheap
- Very limited capabilities

Verdict

Mistral Small 3 is cheaper at $0.100/M, but OpenAI o3-mini scores higher on benchmarks (80 vs 42).

Choose Mistral Small 3 for cost-sensitive projects, OpenAI o3-mini when performance matters most.

Compare with Other Models

Claude Sonnet 4

Anthropic

Anthropic's balanced model for coding and general tasks. Best price-performance ratio in the Claude family.

$3.00/M input $15.00/M output ~$4.66 per medium feature

Claude Opus 4

Anthropic

Anthropic's most powerful model. Best for complex reasoning and challenging coding tasks.

$15.00/M input $75.00/M output ~$23.29 per medium feature

Claude 3.5 Sonnet

Anthropic

Previous generation Sonnet. Still excellent for coding tasks at the same price point.

$3.00/M input $15.00/M output ~$4.66 per medium feature

Claude 3.5 Haiku

Anthropic

Fast, cost-effective model for high-volume tasks. Great for code review and simple queries.

$0.800/M input $4.00/M output ~$1.24 per medium feature

Claude 3 Opus

Anthropic

First generation Opus. Highest reasoning capability in the Claude 3 family.

$15.00/M input $75.00/M output ~$20.25 per medium feature

Claude 3 Sonnet

Anthropic

First generation Sonnet. Balanced performance for general tasks.

$3.00/M input $15.00/M output ~$4.05 per medium feature