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Reasoning Models (June 2025)

The latest breakthrough in AI: specialized reasoning models that excel at complex problem-solving, multi-step analysis, and advanced mathematical reasoning. Updated with June 2025 releases.

🚀 Major 2025 Breakthrough:

Reasoning models represent the biggest AI advancement in 2025, with specialized architectures for complex problem-solving and 80-95% price reductions making them accessible to everyone.

OpenAI o3-pro

OpenAI

Generally Available

Pricing (Per Million Tokens)

$20 per million input tokens, $80 per million output tokens

Context Length

128K tokens

Key Capabilities

Advanced reasoning Complex problem solving Multi-step analysis Scientific reasoning

Best Use Case

Most complex reasoning tasks, research, advanced analysis

OpenAI o3

OpenAI

Generally Available

Pricing (Per Million Tokens)

$2 per million input tokens, $8 per million output tokens

Context Length

128K tokens

Key Capabilities

Reasoning Problem solving 80% price reduction Balanced performance

Best Use Case

General reasoning tasks, cost-effective analysis

DeepSeek-R1

DeepSeek

Generally Available

Pricing (Per Million Tokens)

$0.55 per million input tokens, $2.19 per million output tokens

Context Length

32K tokens

Key Capabilities

90-95% cheaper reasoning Mathematical problem solving Code reasoning Budget-friendly

Best Use Case

Budget-conscious reasoning tasks, experimentation

Claude 4 Sonnet (Reasoning)

Anthropic

Generally Available

Pricing (Per Million Tokens)

$4 per million input tokens, $20 per million output tokens

Context Length

200K tokens

Key Capabilities

Enhanced reasoning Problem solving Safety measures Long context

Best Use Case

Safe reasoning tasks, document analysis

Gemini 2.5 Flash (Thinking)

Google

Preview

Pricing (Per Million Tokens)

$0.15 per million input tokens, $3.50 per million output tokens

Context Length

1M tokens

Key Capabilities

Thinking mode Chain of thought Fast processing Large context

Best Use Case

Visible reasoning processes, educational applications

Magistral Medium

Mistral AI

Generally Available

Pricing (Per Million Tokens)

$1.20 per million input tokens, $4.80 per million output tokens

Context Length

32K tokens

Key Capabilities

European alternative GDPR compliant Privacy-first Mathematical reasoning

Best Use Case

European compliance requirements, privacy-sensitive tasks

Reasoning Model Cost Revolution

How 2025 pricing changes make advanced reasoning accessible

Model	Input Cost	Output Cost	Cost Reduction
DeepSeek-R1	$0.55	$2.19	90-95% cheaper
OpenAI o3	$2.00	$8.00	80% cheaper
OpenAI o3-pro	$20.00	$80.00	Premium tier