GPT-5.3-Codex vs Together AI - Llama 3 8B Lite
GPT-5.3-Codex (2026) and Together AI - Llama 3 8B Lite (2025) are agentic coding models from OpenAI and AI at Meta. GPT-5.3-Codex ships a not-yet-sourced context window, while Together AI - Llama 3 8B Lite ships a 8K-token context window. On pricing, Together AI - Llama 3 8B Lite costs $0.1/1M input tokens versus $1.75/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Together AI - Llama 3 8B Lite is ~1650% cheaper at $0.1/1M; pay for GPT-5.3-Codex only for coding workflow support.
Specs
| Released | 2026-02-05 | 2025-07-15 |
| Context window | — | 8K |
| Parameters | — | 8B |
| Architecture | decoder only | decoder only |
| License | Proprietary | Open Source |
| Knowledge cutoff | - | 2024-03 |
Pricing and availability
| GPT-5.3-Codex | Together AI - Llama 3 8B Lite | |
|---|---|---|
| Input price | $1.75/1M tokens | $0.1/1M tokens |
| Output price | $14/1M tokens | $0.1/1M tokens |
| Providers |
Capabilities
| GPT-5.3-Codex | Together AI - Llama 3 8B Lite | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on multimodal input: GPT-5.3-Codex and code execution: GPT-5.3-Codex. Both models share function calling, tool use, and structured outputs, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, GPT-5.3-Codex lists $1.75/1M input and $14/1M output tokens, while Together AI - Llama 3 8B Lite lists $0.1/1M input and $0.1/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Together AI - Llama 3 8B Lite lower by about $5.33 per million blended tokens. Availability is 1 providers versus 1, so concentration risk also matters.
Choose GPT-5.3-Codex when coding workflow support are central to the workload. Choose Together AI - Llama 3 8B Lite when provider fit and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency.
FAQ
Which is cheaper, GPT-5.3-Codex or Together AI - Llama 3 8B Lite?
Together AI - Llama 3 8B Lite is cheaper on tracked token pricing. GPT-5.3-Codex costs $1.75/1M input and $14/1M output tokens. Together AI - Llama 3 8B Lite costs $0.1/1M input and $0.1/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is GPT-5.3-Codex or Together AI - Llama 3 8B Lite open source?
GPT-5.3-Codex is listed under Proprietary. Together AI - Llama 3 8B Lite is listed under Open Source. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for multimodal input, GPT-5.3-Codex or Together AI - Llama 3 8B Lite?
GPT-5.3-Codex has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for function calling, GPT-5.3-Codex or Together AI - Llama 3 8B Lite?
Both GPT-5.3-Codex and Together AI - Llama 3 8B Lite expose function calling. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for tool use, GPT-5.3-Codex or Together AI - Llama 3 8B Lite?
Both GPT-5.3-Codex and Together AI - Llama 3 8B Lite expose tool use. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run GPT-5.3-Codex and Together AI - Llama 3 8B Lite?
GPT-5.3-Codex is available on OpenRouter. Together AI - Llama 3 8B Lite is available on Together AI. Provider coverage can affect latency, region availability, compliance posture, and fallback options. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
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Last reviewed: 2026-04-24. Data sourced from public model cards and provider documentation.