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 listed serving route per 1M tokens, from LiteLLM and OpenRouter.

Verdict

computed from the published numbers

GPT-5.4 wins on price and on intelligence. GPT-5.5 wins on Terminal-Bench.

Price
GPT-5.4
Terminal-Bench
GPT-5.5
Intelligence
GPT-5.4
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 listed route · per 1M tokens
On-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
GPT-5.4GPT-5.5
Input $/1M$2.50via Databricks best$5.00via OpenAI
Output $/1M$15.00via OpenAI best$30.00via OpenAI
Context window1.1M 1.1M
Max output128K 128K
Serving providers6 6
DateReleased Mar 5, 2026 Released Apr 23, 2026

Benchmarks

Benchmark scores, side by side
GPT-5.4GPT-5.5
Intelligence39.0 best38.4
Terminal-Bench78% 84% best
GPQA Diamond92% 94% best
Output speed92 t/s 102 t/s best
Latency (TTFT)192.30s 70.60s best

Cost calculator

choose a serving route for each side
Input tokens / month
Output tokens / month
GPT-5.4
via Databricks
$27
GPT-5.5
via OpenAI
$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) from Databricks. GPT-5.4 is cheaper for output ($15.00 vs $30.00 per 1M tokens) from OpenAI.
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 benchmarks, GPT-5.5 leads on Terminal-Bench, and GPT-5.4 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026

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