chore: update openai.ts pricing (#755) #6778

Job	Run time
build-and-check	2m 52s
test-integration-packages/billing	1m 9s
test-integration-packages/internal	1m 1s
test-integration-sdk	1m 23s
test-integration-web	40s
test-.agents	39s
test-cli	51s
test-integration-common	40s
test-packages/agent-runtime	43s
test-common	51s
test-integration-cli	48s
test-sdk	41s
test-web	1m 8s
test-integration-packages/agent-runtime	38s
test-packages/billing	46s
test-packages/internal	51s
	15m 41s

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