Claude Sonnet 4.5 vs GPT-5.4 Nano
Complete pricing and performance comparison between Anthropic's Claude Sonnet 4.5 and OpenAI's GPT-5.4 Nano.
Quick Verdict
Cheaper
GPT-5.4 Nano
15.0x cheaper input, 12.0x cheaper output
Larger Context
GPT-5.4 Nano
400K vs 200K
Pricing Comparison
| Spec | Claude Sonnet 4.5 | GPT-5.4 Nano | Difference |
|---|---|---|---|
| Provider | Anthropic | OpenAI | |
| Input / 1M tokens | $3 | $0.2 | GPT-5.4 Nano is 93% more expensive |
| Output / 1M tokens | $15 | $1.25 | GPT-5.4 Nano is 92% more expensive |
| Context Window | 200K | 400K | 2x difference |
| Max Output | 64K | 128K | |
| Tokenizer | cl100k_base | o200k_base |
Cost at Scale
Estimated cost at different usage levels (3:1 input-to-output token ratio, typical for chat).
| Usage | Claude Sonnet 4.5 | GPT-5.4 Nano | Savings |
|---|---|---|---|
Single request 1K in / 300 out | $0.0075 | $0.0006 | GPT-5.4 Nano saves $0.0069 |
10 requests 10K in / 3K out | $0.075 | $0.0057 | GPT-5.4 Nano saves $0.069 |
100 requests 100K in / 30K out | $0.750 | $0.058 | GPT-5.4 Nano saves $0.693 |
1,000 requests 1M in / 300K out | $7.50 | $0.575 | GPT-5.4 Nano saves $6.92 |
10,000 requests 10M in / 3M out | $75.00 | $5.75 | GPT-5.4 Nano saves $69.25 |
1M requests/mo 1B in / 300M out | $7500.00 | $575.00 | GPT-5.4 Nano saves $6925.00 |
Pros & Cons
Claude Sonnet 4.5 Strengths
Part of the Anthropic ecosystem
GPT-5.4 Nano Strengths
- +Cheaper input tokens
- +Cheaper output tokens
- +Larger context window (400K 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 Nano for
- →Budget-conscious projects where cost is the primary factor
- →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 Nano?
For input tokens, GPT-5.4 Nano is 15.0x cheaper at $0.2/1M tokens. For output tokens, GPT-5.4 Nano is 12.0x cheaper at $1.25/1M tokens. At typical usage (1M input + 300K output), Claude Sonnet 4.5 costs $7.50 vs GPT-5.4 Nano at $0.575.
What's the context window difference?
Claude Sonnet 4.5 supports 200K context (200,000 tokens), while GPT-5.4 Nano supports 400K (400,000 tokens). GPT-5.4 Nano can handle 2x more context in a single request.
When should I choose Claude Sonnet 4.5 over GPT-5.4 Nano?
Choose Claude Sonnet 4.5 when you need: a Anthropic ecosystem model. Choose GPT-5.4 Nano when you need: Cheaper input tokens, Cheaper output tokens, Larger context window (400K 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 Nano = $5.75. At 10K input + 1K output per request (longer conversations): Claude Sonnet 4.5 = $450.00, GPT-5.4 Nano = $32.50.
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