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gpt-5:flexOpenAI Inc.

in /1M$0.63input tokens
out /1M$5.00output tokens
context400K128K out
trainingnoon your prompts
api
chat
hosting
US
model lab
OpenAI
weights
closed
added
August 2025
model id
openai/gpt-5:flex

capabilities 5/8

visionreasoningtoolscachingweb searchjson schemacomputer useimage gen

2 providers serve gpt-5. This page is one of them. Compare all endpoints

pricing

no markup
input
$0.63
output
$5.00
cache write
-
cache read
$0.06

worked cost

Estimated cost for three request volumes
volumecost
100K in + 10K out$0.11
1M in + 100K out$1.13
10M in + 1M out$11.25

Requesty charges what the upstream provider charges, with no markup and no per-request fee. Prompt caching and smart routing cut the effective cost further on repeated context. Gateway pricing

provider price, passed throughper 1M tokens

measured

through Sep 12

no measured traffic for this endpoint yet. pricing above is the provider's own

benchmarks

artificial analysis
Benchmark scores, each normalised to 100
evalScore as a share of 100/100
Math Index94.3
AIME 202594.3
MMLU Pro87.1
GPQA Diamond85.4
τ²-Bench84.8
LiveCodeBench84.6
Coding Index37.8
Terminal-Bench Hard32.6
Humanity's Last Exam28.5
Intelligence Index23.0
10 evalsmean65.2

Scores from Artificial Analysis and public leaderboards, normalised to 100. Bar colour is the band, not the rank: green 80 and up, blue 55 and up, amber 30 and up. Benchmarks measure narrow skills, so test on your own workload before committing. Released 2025-08-07.

policy

data terms
retention
30 days
trains on prompts
no
hosted in
US

Terms are the provider's, not Requesty's: routing a request here puts it under them. OpenAI Privacy Policy

Need every request to stay in one jurisdiction? EU hosting routes only through EU-hosted providers.

quickstart

openai compatible
openai/gpt-5:flex

this id pins the openai inc. deployment, with no routing and no failover. the managed id on the canonical page routes across all 2 providers instead

main.py
from openai import OpenAI client = OpenAI(    api_key="YOUR_REQUESTY_API_KEY",    base_url="https://router.requesty.ai/v1",) response = client.chat.completions.create(    model="openai/gpt-5:flex",    messages=[        {"role": "user", "content": "Explain quantum computing in one paragraph."},    ],) print(response.choices[0].message.content)

Change the base url to https://router.requesty.ai/v1, use your Requesty key, set the model to the id above. Existing OpenAI SDK code needs no other edit, and the same key reaches every other model in the catalog. Browse all models

notes

reference

GPT-5 is OpenAI's flagship model for coding, reasoning, and agentic tasks across domains.

questions 6

How much does gpt-5:flex cost?
gpt-5:flex is priced at $0.63 per million input tokens and $5.00 per million output tokens when accessed via Requesty. Prompt caching is supported, which can cut effective input cost by up to 90% on repeated context. Requesty charges exactly what the upstream provider charges, we don't add markup.
What is the context window of gpt-5:flex?
gpt-5:flex has a context window of 400K tokens, with a maximum output of 128K tokens per response. That is roughly 533 words of input you can fit in a single prompt.
How does gpt-5:flex perform on benchmarks?
gpt-5:flex scores 94.3% on Math Index, 94.3% on AIME 2025, 87.1% on MMLU Pro. The benchmarks pane shows every published result, each normalised to 100.
What can gpt-5:flex do?
gpt-5:flex supports vision input, tool calling, extended reasoning, prompt caching, structured outputs (JSON schema). You can call it through any OpenAI-compatible client by pointing base_url to Requesty.
How do I use gpt-5:flex with the OpenAI SDK?
Install the OpenAI SDK, set base_url to "https://router.requesty.ai/v1", set your API key to your Requesty key, and set the model to "openai/gpt-5:flex". The quickstart pane shows Python, JavaScript and cURL snippets.
Can I run gpt-5:flex through Requesty?
Yes. gpt-5:flex runs through Requesty's OpenAI-compatible API, served from OpenAI Inc.. You do not host the model yourself: point base_url at Requesty, set the model to "openai/gpt-5:flex", and requests are routed to the upstream provider with automatic failover. The same key gives you 600+ other models too.

more from openai inc. 8

Other OpenAI Inc. endpoints
endpointctxin /M
gpt-6-astra:flex1.1M$5.00
gpt-6-astra1.1M$10.00
gpt-5.6-luna1.1M$0.20
gpt-5.6-luna:flex1.1M$0.10
gpt-5.6-terra1.1M$2.00
gpt-5.6-terra:flex1.1M$1.00
gpt-5.6-sol:flex1.1M$2.50
gpt-5.6-sol1.1M$4.00

call gpt-5:flex through one endpoint

One key for this endpoint and 600+ other models. No markup on provider prices, automatic failover when a provider degrades, and prompt caching built in. Methodology

gpt-5:flexopenai inc.in $0.63 /1Mout $5.00 /1Mctx 400Khosted US2 providers serve this model