Knowledge
Directional only- GPT-5.4 mini
- 55.6
- Supported · #52/183
- Kimi K2
- 33.2
- Estimated · #170/183
- Basis
- BenchAlign lane · 5 vs 0 public rows
- Reading
- Directional only
GPT-5.4 mini vs Kimi K2
Updated September 10, 2026. Public scores include evidence status and uncertainty. They are not guarantees for a specific workload.
Decision reading
GPT-5.4 mini has the higher public score, 61.11 versus 23.26, and the 90% score intervals do not overlap.
2 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.
Share or export
Which one for your work
Recommendations appear only when a shared evidence basis or an explicit operating constraint supports the call. Secondary and unsupported use cases stay disclosed below the initial list.
Long documents
Prompts that approach the documented context limit
GPT-5.4 mini
GPT-5.4 mini has the larger documented context window.
Confidence: documented
Chat turn cost
1K fresh input + 500 output tokens
Kimi K2
Kimi K2 has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.
Confidence: listed-rates
Show secondary and unsupported calls
Repository review cost
50K fresh input + 3K output tokens
Kimi K2
Kimi K2 has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.
Confidence: listed-rates
Coding work
Code generation, repair, and software-engineering tasks
Not enough matched evidence
Kimi K2 is not ranked on the public lane for coding, so no winner is named for coding.
Confidence: limited
Agentic work
Tool use, computer use, and multi-step task completion
Not enough matched evidence
Kimi K2 is not ranked on the public lane for agentic, so no winner is named for agentic.
Confidence: limited
Cache-heavy agent loop cost
200K cached + 20K fresh input + 10K output tokens
Not enough matched evidence
The page does not recommend a cost winner because at least one model cannot fit the stated workload in one request. Kimi K2 does not fit this workload in one request. Kimi K2 has no published cached-input rate, so cached tokens use its listed input rate.
Confidence: rate-fallback
What is actually comparable
Shared results can support a head-to-head reading. Results present for only one model describe coverage, not superiority.
17 GPT-5.4 mini only
2 Shared
- Shared results
- 2
- GPT-5.4 mini only
- 17
- Kimi K2 only
- 0
- Like-for-like categories
- 0 / 8
2 categories rest on Estimated evidence or different evidence sets. Those rows remain visible for coverage context but do not name a winner.
Category results, on a stated basis
Each row shows the public-lane category score for both models: the BenchAlign lane for agentic, coding, and knowledge, and the weighted public rows elsewhere, with the same rank each model page reports. A row is like-for-like only when both scores rest on Supported evidence or the same weighted set. Directional and not-comparable rows remain visible, but they never receive a winner.
Instruction following
Directional only- GPT-5.4 mini
- 89.8
- #23/123
- Kimi K2
- 48.6
- #84/123
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Directional only
Agentic
Not comparable- GPT-5.4 mini
- 39.1
- Estimated · #119/152
- Kimi K2
- Not ranked
- Basis
- BenchAlign lane · 6 vs 0 public rows
- Reading
- Not comparable
Coding
Not comparable- GPT-5.4 mini
- 42.7
- Supported · #104/151
- Kimi K2
- Not ranked
- Basis
- BenchAlign lane · 4 vs 0 public rows
- Reading
- Not comparable
Reasoning
Not comparable- GPT-5.4 mini
- 73.9
- Unranked · 2 rankable rows
- Kimi K2
- 57.4
- Unranked · 2 rankable rows
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Math
Not comparable- GPT-5.4 mini
- 44.5
- Unranked · 2 rankable rows
- Kimi K2
- 39.2
- Unranked · 2 rankable rows
- Basis
- Provisional lane · 2 vs 2 weighted rows
- Reading
- Not comparable
Multilingual
Not comparable- GPT-5.4 mini
- Not ranked
- Kimi K2
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Multimodal
Not comparable- GPT-5.4 mini
- 57.2
- #31/48
- Kimi K2
- Not ranked
- Basis
- Provisional lane · 1 vs 0 weighted rows
- Reading
- Not comparable
| Category | GPT-5.4 mini | Kimi K2 | Basis | Reading |
|---|---|---|---|---|
| Knowledge | 55.6Supported · #52/183 | 33.2Estimated · #170/183 | Directional onlyBenchAlign lane · 5 vs 0 public rows | Directional only |
| Instruction following | 89.8#23/123 | 48.6#84/123 | Directional onlyProvisional lane · 0 vs 0 weighted rows | Directional only |
| Agentic | 39.1Estimated · #119/152 | Not ranked | Not comparableBenchAlign lane · 6 vs 0 public rows | Not comparable |
| Coding | 42.7Supported · #104/151 | Not ranked | Not comparableBenchAlign lane · 4 vs 0 public rows | Not comparable |
| Reasoning | 73.9Unranked · 2 rankable rows | 57.4Unranked · 2 rankable rows | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Math | 44.5Unranked · 2 rankable rows | 39.2Unranked · 2 rankable rows | Not comparableProvisional lane · 2 vs 2 weighted rows | Not comparable |
| Multilingual | Not ranked | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Multimodal | 57.2#31/48 | Not ranked | Not comparableProvisional lane · 1 vs 0 weighted rows | Not comparable |
Ranks count the models scored in each category’s lane, so the agentic, coding, and knowledge denominators (BenchAlign) differ from the provisional-lane categories. Unranked scores sit on the lane’s scale but never name a winner. Like-for-like rows within 0.5 points read as a practical tie.
Shape of the matched evidence
Only shared public evidence is shown. Sparse evidence stays a ruled list rather than being closed into a radar shape.
Too few matched category axes support a radar. The ruled list below shows only shared benchmark results; positions use each benchmark’s normalized display scale when available.
FrontierMath v2 (Tiers 1-3)
Math
FrontierMath v2 (Tier 4)
Math
What each workload costs
Three fixed token mixes turn per-token rates into comparable decisions. Each scenario states context fit and whether cached input had to fall back to the published list-input rate.
Chat turn
1K fresh input + 500 output tokens
- GPT-5.4 mini
- $0.003
- Fits in one request
- Kimi K2
- $0.00185
- Fits in one request
Kimi K2 has the lower modeled cost
Costs use the listed standard API rates.
Repository review
50K fresh input + 3K output tokens
- GPT-5.4 mini
- $0.051
- Fits in one request
- Kimi K2
- $0.0375
- Fits in one request
Kimi K2 has the lower modeled cost
Costs use the listed standard API rates.
Cache-heavy agent loop
200K cached + 20K fresh input + 10K output tokens
- GPT-5.4 mini
- $0.075
- Fits in one request
- Kimi K2
- $0.157
- Does not fit in one request
- Cached input priced at the published list-input rate
Kimi K2 does not fit this workload in one request. Kimi K2 has no published cached-input rate, so cached tokens use its listed input rate.
Specification differences
Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.
SpecificationGPT-5.4 miniKimi K2
Context window
Maximum documented context; output-token limits may be lower.
GPT-5.4 mini
Kimi K2
128K
API model ID
GPT-5.4 mini
gpt-5.4-mini
OpenAI GPT-5.4 mini model documentationKimi K2
Not sourced
Cached-input rate
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
GPT-5.4 mini
$0.075 per 1M cached input tokens
OpenAI pricingKimi K2
Not published
Documented inputs
GPT-5.4 mini
text, image
OpenAI model catalogKimi K2
Not sourced
Documented outputs
GPT-5.4 mini
Kimi K2
Not sourced
Provider availability
GPT-5.4 mini
Generally Available · OpenAI Responses API
OpenAI model catalogKimi K2
Not sourced
Reasoning profile
GPT-5.4 mini
Reasoning
Kimi K2
Non-Reasoning
Weight access
GPT-5.4 mini
Proprietary
Kimi K2
Proprietary
License
GPT-5.4 mini
Proprietary
Kimi K2
Proprietary
Release date
GPT-5.4 mini
2026-03-17
Kimi K2
2025-07-01
If you already use one of these models
- Deployment change
- The models list different providers, so authentication, endpoint behavior, limits, and feature support may change.
- Quality signal
- GPT-5.4 mini has the higher public score, 61.11 versus 23.26, and the 90% score intervals do not overlap.
- Workload cost
- Repository review: $0.051 vs $0.0375. Cache-heavy agent loop: $0.075 vs $0.157.
- Context tradeoff
- GPT-5.4 mini has the larger documented window (400K).
Run the same representative tasks against both endpoints before changing production traffic.
Benchmark evidence
The full public result ledger is available for audit without forcing a wide desktop table onto a phone.
Browse raw public benchmark evidence19 rows
Agentic
Terminal-Bench 2.0
GPT-5.4 mini60%SourceKimi K2—Not directly comparable
OSWorld-Verified
GPT-5.4 mini72.1%SourceKimi K2—Not directly comparable
MCP Atlas
GPT-5.4 mini57.7%SourceKimi K2—Not directly comparable
Toolathlon
GPT-5.4 mini42.9%SourceKimi K2—Not directly comparable
τ²-bench results
GPT-5.4 mini93.4%SourceKimi K2—Not directly comparable
Terminal-Bench 2.1 (Vals)
GPT-5.4 mini54.7%SourceKimi K2—Not directly comparable
Coding
Knowledge
GPQA
GPT-5.4 mini88%SourceKimi K2—Not directly comparable
HLE
GPT-5.4 mini41.5%SourceKimi K2—Not directly comparable
HLE w/o tools
GPT-5.4 mini28.2%SourceKimi K2—Not directly comparable
GPQA Diamond (Vals)
GPT-5.4 mini83.1%SourceKimi K2—Not directly comparable
MMLU-Pro (Vals)
GPT-5.4 mini84.6%SourceKimi K2—Not directly comparable
Math
FrontierMath v2 (Tiers 1-3)
Shared sourceGPT-5.4 mini28.280%Kimi K221.404%GPT-5.4 mini leads this result
FrontierMath v2 (Tier 4)
Shared sourceGPT-5.4 mini2.080%Kimi K20.000%GPT-5.4 mini leads this result
Multimodal
Frequently asked questions
Which is better, GPT-5.4 mini or Kimi K2?
GPT-5.4 mini has the higher public score, 61.11 versus 23.26, and the 90% score intervals do not overlap. That is the clearest overall quality signal in the current public data.
Which is better for coding, GPT-5.4 mini or Kimi K2?
Kimi K2 is not ranked on the public lane for coding, so no winner is named for coding.
Which is better for agentic tasks, GPT-5.4 mini or Kimi K2?
Kimi K2 is not ranked on the public lane for agentic tasks, so no winner is named for agentic tasks.
Which costs less, GPT-5.4 mini or Kimi K2?
For the stated presets, chat costs $0.003 on GPT-5.4 mini and $0.00185 on Kimi K2; repository review costs $0.051 and $0.0375; the cache-heavy agent loop costs $0.075 and $0.157. Kimi K2 does not fit this workload in one request. Kimi K2 has no published cached-input rate, so cached tokens use its listed input rate.
Which has the larger context window, GPT-5.4 mini or Kimi K2?
GPT-5.4 mini has the larger documented context window: 400K, compared with 128K.
Related comparisons
Last updated September 10, 2026
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