GPT-5.4 vs Kimi K2 Instruct
GPT-5.4 (2026) and Kimi K2 Instruct (2025) are frontier-tier reasoning models from OpenAI and Moonshot AI. GPT-5.4 ships a 1.05m-token context window, while Kimi K2 Instruct ships a 131k-token context window. On pricing, GPT-5.4 ranges from $2.50 to $5/1M input tokens by tier; Kimi K2 Instruct costs $0.57/1M input tokens. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
GPT-5.4 fits 8x more tokens; pick it for long-context work and Kimi K2 Instruct for tighter calls.
Decision scorecard
Local evidence first| Signal | GPT-5.4 | Kimi K2 Instruct |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps and provider-routed production |
| Decision fit | Coding, RAG, and Agents | RAG, Long context, and Classification |
| Context window | 1.05m | 131k |
| Cheapest output | $15/1M tokens | $2.30/1M tokens |
| Provider routes | 4 tracked | 5 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- GPT-5.4 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5.4 uniquely exposes Vision, Multimodal, and JSON / Tool use in local model data.
- Local decision data tags GPT-5.4 for Coding, RAG, and Agents.
- Kimi K2 Instruct has the lower cheapest tracked output price at $2.30/1M tokens.
- Kimi K2 Instruct has broader tracked provider coverage for fallback and route flexibility.
- Local decision data tags Kimi K2 Instruct for RAG, Long context, and Classification.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
GPT-5.4
$5,750
Cheapest tracked route/tier: OpenAI API
Kimi K2 Instruct
$1,031
Cheapest tracked route/tier: Vercel AI Gateway
Estimated monthly gap: $4,719. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on Vercel AI Gateway; start route-level A/B tests there.
- Kimi K2 Instruct is $12.70/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and JSON / Tool use before moving production traffic.
- Provider overlap exists on Vercel AI Gateway; start route-level A/B tests there.
- GPT-5.4 is $12.70/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- GPT-5.4 adds Vision, Multimodal, and JSON / Tool use in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-03-05 | 2025-09-05 |
| Context window | 1.05m | 131k |
| Parameters | — | 1T total, 32B active (MoE) |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | MITOSI-approved |
| Openness | Proprietary | Open source |
| Weights | Not released | Unknown |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | 2025-08 | - |
Pricing and availability
| Pricing attribute | GPT-5.4 | Kimi K2 Instruct |
|---|---|---|
| Input price |
| $0.57/1M tokens |
| Output price |
| $2.30/1M tokens |
| Providers |
Capabilities
| Capability | GPT-5.4 | Kimi K2 Instruct |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | Yes |
| JSON / Tool use | Yes | No |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.