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Claude Sonnet 4.5 vs GPT-5 Mini

Complete pricing and performance comparison between Anthropic's Claude Sonnet 4.5 and OpenAI's GPT-5 Mini.

Quick Verdict

Cheaper
GPT-5 Mini
12.0x cheaper input, 7.5x cheaper output
Larger Context
GPT-5 Mini
400K vs 200K

Pricing Comparison

SpecClaude Sonnet 4.5GPT-5 MiniDifference
ProviderAnthropicOpenAI
Input / 1M tokens$3$0.25GPT-5 Mini is 92% more expensive
Output / 1M tokens$15$2GPT-5 Mini is 87% more expensive
Context Window200K400K2x difference
Max Output64K16K
Tokenizercl100k_baseo200k_base

Performance Benchmarks

MetricClaude Sonnet 4.5GPT-5 MiniWinner
Quality Index--41N/A
Output Speed--82 tok/sN/A
Value (Quality/$)--164.8Higher = better value

Benchmark data from Artificial Analysis. Quality Index is a composite score across reasoning, coding, and knowledge tasks.

Cost at Scale

Estimated cost at different usage levels (3:1 input-to-output token ratio, typical for chat).

UsageClaude Sonnet 4.5GPT-5 MiniSavings
Single request
1K in / 300 out
$0.0075$0.0008GPT-5 Mini saves $0.0066
10 requests
10K in / 3K out
$0.075$0.0085GPT-5 Mini saves $0.067
100 requests
100K in / 30K out
$0.750$0.085GPT-5 Mini saves $0.665
1,000 requests
1M in / 300K out
$7.50$0.850GPT-5 Mini saves $6.65
10,000 requests
10M in / 3M out
$75.00$8.50GPT-5 Mini saves $66.50
1M requests/mo
1B in / 300M out
$7500.00$850.00GPT-5 Mini saves $6650.00

Pros & Cons

Claude Sonnet 4.5 Strengths

  • +Higher max output tokens

GPT-5 Mini Strengths

  • +Cheaper input tokens
  • +Cheaper output tokens
  • +Larger context window (400K vs 200K)

When to Use Each Model

Choose Claude Sonnet 4.5 for

  • Generating long-form content or detailed code

Choose GPT-5 Mini for

  • Budget-conscious projects where cost is the primary factor
  • Long documents, large codebases, or multi-turn conversations

Frequently Asked Questions

Which is cheaper, Claude Sonnet 4.5 or GPT-5 Mini?
For input tokens, GPT-5 Mini is 12.0x cheaper at $0.25/1M tokens. For output tokens, GPT-5 Mini is 7.5x cheaper at $2/1M tokens. At typical usage (1M input + 300K output), Claude Sonnet 4.5 costs $7.50 vs GPT-5 Mini at $0.850.
What's the context window difference?
Claude Sonnet 4.5 supports 200K context (200,000 tokens), while GPT-5 Mini supports 400K (400,000 tokens). GPT-5 Mini can handle 2x more context in a single request.
Which model has better benchmarks?
When should I choose Claude Sonnet 4.5 over GPT-5 Mini?
Choose Claude Sonnet 4.5 when you need: Higher max output tokens. Choose GPT-5 Mini when you need: Cheaper input tokens, Cheaper output tokens, Larger context window (400K vs 200K).
How much would 10,000 API requests cost?
At 1K input + 300 output tokens per request (typical chat): Claude Sonnet 4.5 = $75.00, GPT-5 Mini = $8.50. At 10K input + 1K output per request (longer conversations): Claude Sonnet 4.5 = $450.00, GPT-5 Mini = $45.00.

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