o3 vs GPT-5 for Reasoning: India ₹ Guide

o3 and GPT-5 are both OpenAI models available through unoblox, but they come from different lineages — o3 from OpenAI's reasoning-focused "o" series, GPT-5 as the current generalist flagship. Only one of them has a fixed ₹ price in unoblox's published rate card today.

Two different OpenAI lineages

OpenAI built the o-series, including o3, with a specific focus on step-by-step reasoning tasks, while the GPT series — now at GPT-5 — is positioned as the general-purpose default. That's OpenAI's own framing of the two families, not a claim about which scores higher on any particular benchmark; unoblox doesn't publish or endorse specific benchmark numbers, so the only reliable test is your own prompts.

Pricing: one is fixed, one is live-only

Model	Model id	Input (₹ / 1M tokens)	Output (₹ / 1M tokens)
GPT-5	openai/gpt-5	₹126	₹1,008
o3	openai/o3	see live ₹ pricing	see live ₹ pricing

GPT-5's rate is fixed and published above. o3's current ₹ rate isn't part of that fixed list — check its live model page at https://unoblox.ai/models/openai/o3 before estimating cost for a production workload that leans on it.

Deciding which one to reach for

• If your task is a well-scoped reasoning problem — multi-step logic, planning, structured problem-solving — o3 is worth testing specifically because that's the lineage OpenAI built it for.
• If your task is general-purpose — drafting, summarising, coding help, conversational use — GPT-5 is the simpler default and its ₹ cost is known upfront.
• For latency-sensitive applications, test both directly; reasoning-focused models can behave differently on response time than generalist ones, and unoblox doesn't publish latency figures — measure it on your own traffic.
• Run a small sample of your actual prompts through both before locking in a choice for production.

Testing both under one key

curl https://api.unoblox.ai/v1/chat/completions \
  -H "Authorization: Bearer ub-gw-xxxxxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{"model":"openai/o3","messages":[{"role":"user","content":"Work through this scheduling conflict step by step."}]}'

Change "model" to openai/gpt-5 to compare outputs side by side — same endpoint, same ub-gw-… key, one monthly GST invoice either way.

Frequently asked questions

Is o3 more expensive than GPT-5? unoblox doesn't publish a fixed ₹ rate for o3 in this comparison — check its live model page for the current number rather than assuming it's higher or lower than GPT-5's ₹126 / ₹1,008 rate.

Which model should I use for step-by-step reasoning tasks? o3 is the lineage OpenAI purpose-built for that kind of task, so it's the sensible first thing to test — but validate against your own prompts rather than assuming it wins automatically.

Can I call o3 and GPT-5 with the same integration code? Yes — both are reachable from the same OpenAI-compatible endpoint on unoblox; only the model field changes.

Does using o3 or GPT-5 keep my prompts and data in India? No. Both run on OpenAI's own infrastructure. unoblox's India value here is ₹ billing, a GST invoice and a single endpoint — not data residency.

Is there a smaller, cheaper OpenAI reasoning-style model to try first? o3-mini and o4-mini are both in the catalog; check the models page at https://unoblox.ai/models for their live ₹ rates before choosing.

How do I avoid a pricing surprise with o3 at scale? Always confirm the live per-token rate on o3's own model page before running high-volume traffic through it, since it isn't part of the fixed price list here.

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