Claude Fable 5$22.000/MClaude Opus 4.8$11.000/MClaude Opus 4.7$11.000/MClaude Opus 4.6$11.000/MClaude Opus 4.5$33.000/MClaude Sonnet 3.7$6.600/MClaude Opus 3$33.000/MClaude 2.1$12.800/MClaude 2$12.800/MGPT-5.5$12.500/MGPT-5.2$5.425/MGPT-5.2-Codex$5.425/MGPT-5$3.875/MGPT-4.5$97.500/MGPT-4 Turbo Preview$16.000/MGPT-4$39.000/MGPT-4-32k$78.000/Mo3$19.000/Mo3-mini$2.090/Mo4-mini$2.090/Mo1$28.500/Mo1-mini$5.700/Mo1-preview$28.500/MGemini 3.5 Pro$5.000/MGemini 3.1 Pro$5.000/MGemini 3 Pro$5.000/MGemini 2.5 Pro$3.875/MGemini 1.5 Pro$2.375/MGemini 1.0 Ultra$12.000/MGemini 1.0 Pro$0.800/MClaude Fable 5$22.000/MClaude Opus 4.8$11.000/MClaude Opus 4.7$11.000/MClaude Opus 4.6$11.000/MClaude Opus 4.5$33.000/MClaude Sonnet 3.7$6.600/MClaude Opus 3$33.000/MClaude 2.1$12.800/MClaude 2$12.800/MGPT-5.5$12.500/MGPT-5.2$5.425/MGPT-5.2-Codex$5.425/MGPT-5$3.875/MGPT-4.5$97.500/MGPT-4 Turbo Preview$16.000/MGPT-4$39.000/MGPT-4-32k$78.000/Mo3$19.000/Mo3-mini$2.090/Mo4-mini$2.090/Mo1$28.500/Mo1-mini$5.700/Mo1-preview$28.500/MGemini 3.5 Pro$5.000/MGemini 3.1 Pro$5.000/MGemini 3 Pro$5.000/MGemini 2.5 Pro$3.875/MGemini 1.5 Pro$2.375/MGemini 1.0 Ultra$12.000/MGemini 1.0 Pro$0.800/M
BETA
Subscribe
← Back to Index·All OpenAI models
OpenAI
OpenAIFrontierRETIRED

GPT-4.5

Near-Frontier

Brief 2025 frontier release ("Orion"). Retired in favour of GPT-5; listed for historical pricing reference only.

GPT-4.5 is a frontier AI model from OpenAI. It costs $75.000 per million input tokens and $150.000 per million output tokens (blended $97.500/M), with a 128K-token context window.

Official model page ↗Provider pricing ↗API docs ↗Compare with another model →Estimate monthly cost →
INPUT
$75.000/M
per million input tokens
OUTPUT
$150.000/M
per million output tokens
BLENDED 70/30
$97.500/M
default reference rate · how it's calculated →
CONTEXT
128K
128,000 tokens
Benchmarks
No published benchmark scores tracked for this model yet. Frontier and reasoning models from major providers have scores; smaller models and inference-host variants typically inherit the underlying open-weights score.
More from OpenAI
See all 25 →
GPT-5.5
Frontier · 1M ctx
in $5.000/Mout $30.000/M
GPT-5.2
Frontier · 400K ctx
in $1.750/Mout $14.000/M
GPT-5.2-Codex
Coding · 400K ctx
in $1.750/Mout $14.000/M
GPT-5
Frontier · 400K ctx
in $1.250/Mout $10.000/M
GPT-4.1
Frontier · 1M ctx
in $2.000/Mout $8.000/M
GPT-4.1 mini
Efficient · 1M ctx
in $0.400/Mout $1.600/M
Frequently asked questions

How much does GPT-4.5 cost?

GPT-4.5 costs $75.000 per million input tokens and $150.000 per million output tokens, for a blended reference rate of $97.500 per million tokens.

What is GPT-4.5's context window?

GPT-4.5 supports up to 128K tokens of context (128,000 tokens).

What is GPT-4.5 best for?

Brief 2025 frontier release ("Orion"). Retired in favour of GPT-5; listed for historical pricing reference only.

Who makes GPT-4.5?

GPT-4.5 is developed and served by OpenAI.