CtrlAltDebrief

GPT-5.4 vs GPT-5.5

API pricing, context window and capabilities for GPT-5.4 and GPT-5.5, side by side. Prices are the cheapest serving route per 1M tokens, verified against LiteLLM and OpenRouter.

Verdict

computed from the published numbers

GPT-5.4 wins on price. GPT-5.5 wins on coding and on intelligence.

Price
GPT-5.4
Coding
GPT-5.5
Intelligence
GPT-5.5
Context window
Tied

Key takeaways

who wins on what, from the published numbers

GPT-5.4 wins

  • Cheaper input ($2.50 vs $5.00 /1M)
  • Cheaper output ($15.00 vs $30.00 /1M)

GPT-5.5 wins

No clear edge on the tracked metrics.

Cheaper overall
GPT-5.4
$2.50 + $15.00 /1M
Larger context
Tied
More providers
Tied

Pricing & specs

cheapest serving route · per 1M tokens
GPT-5.4GPT-5.5
Input $/1M$2.50 best$5.00
Output $/1M$15.00 best$30.00
Context window1.1M 1.1M
Max output128K 128K
Serving providers2 2
Released2026-03-05 2026-04-23

Benchmarks

Artificial Analysis indices, side by side
GPT-5.4GPT-5.5
Intelligence51.4 54.8 best
Coding71.0 74.9 best
GPQA Diamond92% 94% best
Output speed144 t/s best87 t/s
Latency (TTFT)27.88s 23.21s best

Cost calculator

choose a serving route for each side
Input tokens / month
Output tokens / month
GPT-5.4
via Azure
$28
GPT-5.5
via Azure
$55

Capabilities

feature support, side by side
FeatureGPT-5.4GPT-5.5
Vision✓✓
Tool use✓✓
Reasoning✓✓
Audio——
Prompt caching✓✓
Structured output✓✓
Web search✓✓

Related comparisons

Frequently asked questions

Which is cheaper, GPT-5.4 or GPT-5.5?
GPT-5.4 is cheaper for input ($2.50 vs $5.00 per 1M tokens). GPT-5.4 is cheaper for output ($15.00 vs $30.00 per 1M tokens).
What is the context window difference between GPT-5.4 and GPT-5.5?
Both GPT-5.4 and GPT-5.5 have about a 1.1M-token context window.
How do GPT-5.4 and GPT-5.5 compare on benchmarks?
On the tracked Artificial Analysis indices, GPT-5.5 leads on coding, and GPT-5.5 leads on intelligence.
Pricing verified against LiteLLM + OpenRouter + provider pages · refreshed daily

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