GPT-5.4 nano vs Kimi K2 Thinking vs Qwen3.5 Plus
Too close to call on our weighted score (GPT-5.4 nano 68, Qwen3.5 Plus 66, Kimi K2 Thinking 58). The right pick depends on what you value most.
OpenAIGPT-5.4 nano
68/100- ECI145.8
- Price$0.20 / $1.25
- Context400K
Moonshot AIKimi K2 Thinking
58/100- ECI146.0
- Price$0.60 / $2.50
- Context262K
Alibaba (Qwen)Qwen3.5 Plus
66/100- ECI146.8
- Price$0.40 / $2.40
- Context1M
Too close to call
It is close. Our weighted score puts them within 1 points (GPT-5.4 nano 68/100, Qwen3.5 Plus 66/100, Kimi K2 Thinking 58/100), so choose by what matters most for your work: Qwen3.5 Plus for raw capability and GPT-5.4 nano on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityQwen3.5 PlusCapabilities Index (ECI): Qwen3.5 Plus 146.8 · Kimi K2 Thinking 146.0 · GPT-5.4 nano 145.8
- Lowest priceGPT-5.4 nanoGPT-5.4 nano $0.463 · Qwen3.5 Plus $0.90 · Kimi K2 Thinking $1.07 per 1M tokens (3:1 blend)
- Longest contextQwen3.5 PlusQwen3.5 Plus 1,000,000 · GPT-5.4 nano 400,000 · Kimi K2 Thinking 262,144 tokens
- Widest inputsQwen3.5 PlusGPT-5.4 nano: Text, Images · Kimi K2 Thinking: Text · Qwen3.5 Plus: Text, Images, Video
- Self-hostingKimi K2 ThinkingPublishes downloadable weights
| Measure | Weight | GPT-5.4 nano | Kimi K2 Thinking | Qwen3.5 Plus |
|---|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 73 | 73 | 74 |
| Price | 25% | 66 | 48 | 52 |
| Inputs & features | 15% | 70 | 35 | 70 |
| Context window | 10% | 44 | 37 | 60 |
| Overall | 100% | 68/100 | 58/100 | 66/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-5.4 nanoOpenAI | Kimi K2 ThinkingMoonshot AI | Qwen3.5 PlusAlibaba (Qwen) |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 145.8 | 146.0 | 146.8 (best) |
| ECI rank | #75 of 148 | #72 of 148 | #65 of 148 (best) |
| GPQA DiamondGraduate-level science questions | 78.5% | 84.2% | 84.9% (best) |
| FrontierMath Tiers 1–3Research-level mathematics | 44.9% | — | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 87.8% (best) | 83.1% | 86.7% |
| SimpleQA VerifiedShort factual questions | 11.7% | — | 25.4% (best) |
| Price per million tokens | |||
| Input | $0.20 (best) | $0.60 | $0.40 |
| Output | $1.25 (best) | $2.50 | $2.40 |
| Cached input | $0.02 | — | — |
| Blended (3:1) | $0.463 (best) | $1.07 | $0.90 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official OpenAI API | Median of 10 providers | Official Alibaba API |
| Limits | |||
| Context window | 400,000 tokens | 262,144 tokens | 1,000,000 tokens (best) |
| Max output | 128,000 tokens | 262,144 tokens (best) | 65,536 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | No | Yes |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | No | No | Yes |
| Reasoning | Yeslow · medium · high · xhigh | Yes | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | No | No |
| Availability | |||
| Weights | Proprietary | Open | Proprietary |
| API model ID | gpt-5.4-nano | — | qwen3.5-plus |
| API providers | 26 (best) | 10 | 10 |
| Released | Mar 17, 2026 | Nov 6, 2025 | Feb 16, 2026 |
| Knowledge cutoff | Aug 31, 2025 | Aug 2024 | Apr 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT-5.4 nano$4.50
- Kimi K2 Thinking$11.00
- Qwen3.5 Plus$8.80
Which should you choose?
Which is better: GPT-5.4 nano, Kimi K2 Thinking or Qwen3.5 Plus?
It is close. Our weighted score puts them within 1 points (GPT-5.4 nano 68/100, Qwen3.5 Plus 66/100, Kimi K2 Thinking 58/100), so choose by what matters most for your work: Qwen3.5 Plus for raw capability and GPT-5.4 nano on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, GPT-5.4 nano, Kimi K2 Thinking or Qwen3.5 Plus?
GPT-5.4 nano is cheaper at $0.20 input / $1.25 output per million tokens (official OpenAI API price). Qwen3.5 Plus costs $0.40 input / $2.40 output per million tokens (official Alibaba API price); Kimi K2 Thinking costs $0.60 input / $2.50 output per million tokens (median across 10 API providers). At a typical mix of three input tokens to one output token, that is $0.463 per million tokens for GPT-5.4 nano versus $0.90 for Qwen3.5 Plus (1.9× as much) and $1.07 for Kimi K2 Thinking (2.3× as much).
Which scores higher on benchmarks?
Qwen3.5 Plus scores higher on the Capabilities Index (ECI): Qwen3.5 Plus 146.8 (#65 of 148), Kimi K2 Thinking 146.0 (#72 of 148) and GPT-5.4 nano 145.8 (#75 of 148). The confidence ranges of the top two overlap (144.6–148.1 vs 143.4–147.6), so treat the gap as small. On individual benchmarks: GPQA Diamond — Qwen3.5 Plus 84.9%, Kimi K2 Thinking 84.2%, GPT-5.4 nano 78.5%; OTIS Mock AIME 2024–2025 — GPT-5.4 nano 87.8%, Qwen3.5 Plus 86.7%, Kimi K2 Thinking 83.1%.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-5.4 nano, Kimi K2 Thinking and Qwen3.5 Plus yet, so there is no like-for-like coding score. On overall capability, Qwen3.5 Plus leads, which tends to carry over to coding, but test on your own codebase. All three support tool calling for agent workflows.
Which has the bigger context window?
Qwen3.5 Plus has the largest context window at 1,000,000 tokens, against 400,000 for GPT-5.4 nano and 262,144 for Kimi K2 Thinking. Maximum output per response: GPT-5.4 nano up to 128,000, Kimi K2 Thinking up to 262,144, Qwen3.5 Plus up to 65,536 tokens.
Which can read images, PDFs, audio or video?
GPT-5.4 nano accepts text and images; Kimi K2 Thinking accepts text; Qwen3.5 Plus accepts text, images and video. Qwen3.5 Plus handles the widest range of inputs.
Are any of these open source?
Kimi K2 Thinking publishes its weights and can be self-hosted; GPT-5.4 nano and Qwen3.5 Plus is proprietary.
Which is newer?
GPT-5.4 nano is the newest, released Mar 17, 2026. Qwen3.5 Plus came out Feb 16, 2026; Kimi K2 Thinking came out Nov 6, 2025. Knowledge cutoff: GPT-5.4 nano Aug 31, 2025, Kimi K2 Thinking Aug 2024, Qwen3.5 Plus Apr 2025.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
Related comparisons
- GPT-5.4 nano vs MiniMax-M2.7MiniMax · ECI 145.9
- GPT-5.4 nano vs Qwen3.6 35B-A3BAlibaba (Qwen) · ECI 143.9
- GPT-5.4 nano vs DeepSeek V3.2DeepSeek · ECI 146.3
- GPT-5.4 nano vs Nemotron 3 Ultra 550B A55BNVIDIA · ECI 146.2
- Kimi K2 Thinking vs GLM-4.7Z.ai (Zhipu) · ECI 143.5
- Kimi K2 Thinking vs Nemotron 3 Ultra 550B A55BNVIDIA · ECI 146.2
