Great reasoning, pricey outputs
4/5Reliable for complex fixes, but we route simple tasks to cheaper models.
OPOpenAI GPT-5.3 Codex
High-end coding and reasoning model with large context and tool support.
Best for
- •Complex coding assistants and multi-step reasoning.
Limitations
- •Higher output-token cost than budget models.
- •Needs guardrails for autonomous agent loops.
Use carefully when
- •You only need low-cost basic chat responses.
Quickstart
- Enable JSON schema output for stable integrations.
- Add retrieval layer before long-context prompts.
Setup checklist
- • API key required: Yes
- • SDK quality: high
- • Self-host difficulty: hard
Usage Notes
- • Validate model behavior on your own benchmark slices before rollout.
- • Pin version/provider routes for reproducible outputs.
- • Add logging + fallback routes for high-volume workloads.
Pricing (INR)
Input / 1M
₹160.39
Output / 1M
₹1,283.10
Monthly
-
Why this listing is risk-flagged
- • Risk signal: prompt-injection
Capabilities
- contextTokens400000
- toolCallingYes
- structuredOutputYes
- functionCallingYes
Benchmarks
swe Bench Verified
76.8
code Reasoning
90.1
multilingual Code
84.4
Community reviews
1 reviews • avg 4
Samples
codeRefactor patch
Generate migration-safe repository refactor plan.
Compliance
- License: proprietary
- Commercial use: allowed
Provenance
- Last verified: 17/4/2026
- Source: https://openrouter.ai/api/v1/models