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Claude Sonnet 4.5 vs GPT-5.4

Complete pricing and performance comparison between Anthropic's Claude Sonnet 4.5 and OpenAI's GPT-5.4.

Quick Verdict

Cheaper
GPT-5.4 (input) / Claude Sonnet 4.5 (output)
Input: 1.2x diff, Output: 1.0x diff
Larger Context
GPT-5.4
1.1M vs 200K

Pricing Comparison

SpecClaude Sonnet 4.5GPT-5.4Difference
ProviderAnthropicOpenAI
Input / 1M tokens$3$2.5GPT-5.4 is 17% more expensive
Output / 1M tokens$15$15Same
Context Window200K1.1M5x difference
Max Output64K128K
Tokenizercl100k_baseo200k_base

Performance Benchmarks

MetricClaude Sonnet 4.5GPT-5.4Winner
Quality Index--57N/A
Output Speed--75 tok/sN/A
Value (Quality/$)--22.8Higher = 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-5.4Savings
Single request
1K in / 300 out
$0.0075$0.0070Same
10 requests
10K in / 3K out
$0.075$0.070GPT-5.4 saves $0.0050
100 requests
100K in / 30K out
$0.750$0.700GPT-5.4 saves $0.050
1,000 requests
1M in / 300K out
$7.50$7.00GPT-5.4 saves $0.500
10,000 requests
10M in / 3M out
$75.00$70.00GPT-5.4 saves $5.00
1M requests/mo
1B in / 300M out
$7500.00$7000.00GPT-5.4 saves $500.00

Pros & Cons

Claude Sonnet 4.5 Strengths

Part of the Anthropic ecosystem

GPT-5.4 Strengths

  • +Cheaper input tokens
  • +Larger context window (1.1M vs 200K)
  • +Higher max output tokens

When to Use Each Model

Choose Claude Sonnet 4.5 for

  • Projects already integrated with Anthropic's ecosystem

Choose GPT-5.4 for

  • Long documents, large codebases, or multi-turn conversations
  • Generating long-form content or detailed code

Frequently Asked Questions

Which is cheaper, Claude Sonnet 4.5 or GPT-5.4?
For input tokens, GPT-5.4 is 1.2x cheaper at $2.5/1M tokens. For output tokens, Claude Sonnet 4.5 is 1.0x cheaper at $15/1M tokens. At typical usage (1M input + 300K output), Claude Sonnet 4.5 costs $7.50 vs GPT-5.4 at $7.00.
What's the context window difference?
Claude Sonnet 4.5 supports 200K context (200,000 tokens), while GPT-5.4 supports 1.1M (1,050,000 tokens). GPT-5.4 can handle 5x more context in a single request.
Which model has better benchmarks?
When should I choose Claude Sonnet 4.5 over GPT-5.4?
Choose Claude Sonnet 4.5 when you need: a Anthropic ecosystem model. Choose GPT-5.4 when you need: Cheaper input tokens, Larger context window (1.1M vs 200K), Higher max output tokens.
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-5.4 = $70.00. At 10K input + 1K output per request (longer conversations): Claude Sonnet 4.5 = $450.00, GPT-5.4 = $400.00.

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