GPT-5.6 Sol vs Kimi K2.7 Code vs Claude Opus 5
Too close to call on our weighted score (GPT-5.6 Sol 66, Claude Opus 5 66, Kimi K2.7 Code 64). The right pick depends on what you value most.
OpenAIGPT-5.6 Sol
66/100- ECI161.8
- Price$4.00 / $20.00
- Context1.05M
Moonshot AIKimi K2.7 Code
64/100- ECI150.0
- Price$0.95 / $4.00
- Context262K
AnthropicClaude Opus 5
66/100- ECI162.9
- Price$5.00 / $25.00
- Context1M
Too close to call
It is close. Our weighted score puts them within a point (GPT-5.6 Sol 66/100, Claude Opus 5 66/100, Kimi K2.7 Code 64/100), so choose by what matters most for your work: Claude Opus 5 for raw capability, Kimi K2.7 Code on price and GPT-5.6 Sol for long inputs. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityClaude Opus 5Capabilities Index (ECI): Claude Opus 5 162.9 · GPT-5.6 Sol 161.8 · Kimi K2.7 Code 150.0
- Lowest priceKimi K2.7 CodeKimi K2.7 Code $1.71 · GPT-5.6 Sol $8.00 · Claude Opus 5 $10.00 per 1M tokens (3:1 blend)
- Longest contextGPT-5.6 SolGPT-5.6 Sol 1,050,000 · Claude Opus 5 1,000,000 · Kimi K2.7 Code 262,144 tokens
- Widest inputsSame inputsGPT-5.6 Sol: Text, Images, PDFs · Kimi K2.7 Code: Text, Images, Video · Claude Opus 5: Text, Images, PDFs
- Self-hostingKimi K2.7 CodePublishes downloadable weights
| Measure | Weight | GPT-5.6 Sol | Kimi K2.7 Code | Claude Opus 5 |
|---|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 93 | 78 | 94 |
| Price | 25% | 7 | 39 | 2 |
| Inputs & features | 15% | 80 | 80 | 80 |
| Context window | 10% | 61 | 37 | 60 |
| Overall | 100% | 66/100 | 64/100 | 66/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-5.6 SolOpenAI | Kimi K2.7 CodeMoonshot AI | Claude Opus 5Anthropic |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 161.8 | 150.0 | 162.9 (best) |
| ECI rank | #8 of 148 | #49 of 148 | #5 of 148 (best) |
| GPQA DiamondGraduate-level science questions | 93.5% | 87.9% | 93.9% (best) |
| FrontierMath Tiers 1–3Research-level mathematics | 89.1% (best) | 54.0% | 85.6% |
| OTIS Mock AIME 2024–2025Competition mathematics | 100% (best) | 95.6% | 98.9% |
| SimpleQA VerifiedShort factual questions | 69.7% (best) | 36.5% | 59.9% |
| Price per million tokens | |||
| Input | $4.00 | $0.95 (best) | $5.00 |
| Output | $20.00 | $4.00 (best) | $25.00 |
| Cached input | $0.40 | $0.19 (best) | $0.50 |
| Blended (3:1) | $8.00 | $1.71 (best) | $10.00 |
| Long-context rate | Over 272K: $8.00 / $30.00 | Same rate | Same rate |
| Price source | Official OpenAI API | Official Moonshot AI API | Official Anthropic API |
| Limits | |||
| Context window | 1,050,000 tokens (best) | 262,144 tokens | 1,000,000 tokens |
| Max output | 128,000 tokens | 262,144 tokens (best) | 128,000 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | No | Yes |
| Audio | No | No | No |
| Video | No | Yes | No |
| Reasoning | Yeslow · medium · high · xhigh · max | Yes | Yeslow · medium · high · xhigh · max |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | Yes | Yes |
| Availability | |||
| Weights | Proprietary | Open | Proprietary |
| API model ID | gpt-5.6-sol | kimi-k2.7-code | claude-opus-5 |
| API providers | 40 | 51 (best) | 35 |
| Released | Jul 9, 2026 | Jun 12, 2026 | Jul 24, 2026 |
| Knowledge cutoff | Feb 16, 2026 | Jan 2025 | May 2026 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT-5.6 Sol$80.00
- Kimi K2.7 Code$17.50
- Claude Opus 5$100.00
Which should you choose?
Which is better: GPT-5.6 Sol, Kimi K2.7 Code or Claude Opus 5?
It is close. Our weighted score puts them within a point (GPT-5.6 Sol 66/100, Claude Opus 5 66/100, Kimi K2.7 Code 64/100), so choose by what matters most for your work: Claude Opus 5 for raw capability, Kimi K2.7 Code on price and GPT-5.6 Sol for long inputs. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, GPT-5.6 Sol, Kimi K2.7 Code or Claude Opus 5?
Kimi K2.7 Code is cheaper at $0.95 input / $4.00 output per million tokens (official Moonshot AI API price). GPT-5.6 Sol costs $4.00 input / $20.00 output per million tokens (official OpenAI API price); Claude Opus 5 costs $5.00 input / $25.00 output per million tokens (official Anthropic API price). At a typical mix of three input tokens to one output token, that is $1.71 per million tokens for Kimi K2.7 Code versus $8.00 for GPT-5.6 Sol (4.7× as much) and $10.00 for Claude Opus 5 (5.8× as much).
Which scores higher on benchmarks?
Claude Opus 5 scores higher on the Capabilities Index (ECI): Claude Opus 5 162.9 (#5 of 148), GPT-5.6 Sol 161.8 (#8 of 148) and Kimi K2.7 Code 150.0 (#49 of 148). The confidence ranges of the top two overlap (160.2–166.7 vs 159.3–165.3), so treat the gap as small. On individual benchmarks: GPQA Diamond — Claude Opus 5 93.9%, GPT-5.6 Sol 93.5%, Kimi K2.7 Code 87.9%; FrontierMath Tiers 1–3 — GPT-5.6 Sol 89.1%, Claude Opus 5 85.6%, Kimi K2.7 Code 54.0%; OTIS Mock AIME 2024–2025 — GPT-5.6 Sol 100%, Claude Opus 5 98.9%, Kimi K2.7 Code 95.6%; SimpleQA Verified — GPT-5.6 Sol 69.7%, Claude Opus 5 59.9%, Kimi K2.7 Code 36.5%.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-5.6 Sol, Kimi K2.7 Code and Claude Opus 5 yet, so there is no like-for-like coding score. On overall capability, Claude Opus 5 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?
GPT-5.6 Sol has the largest context window at 1,050,000 tokens, against 1,000,000 for Claude Opus 5 and 262,144 for Kimi K2.7 Code. Maximum output per response: GPT-5.6 Sol up to 128,000, Kimi K2.7 Code up to 262,144, Claude Opus 5 up to 128,000 tokens.
Which can read images, PDFs, audio or video?
GPT-5.6 Sol accepts text, images and PDFs; Kimi K2.7 Code accepts text, images and video; Claude Opus 5 accepts text, images and PDFs. They handle the same number of input types.
Are any of these open source?
Kimi K2.7 Code publishes its weights and can be self-hosted; GPT-5.6 Sol and Claude Opus 5 is proprietary.
Which is newer?
Claude Opus 5 is the newest, released Jul 24, 2026. GPT-5.6 Sol came out Jul 9, 2026; Kimi K2.7 Code came out Jun 12, 2026. Knowledge cutoff: GPT-5.6 Sol Feb 16, 2026, Kimi K2.7 Code Jan 2025, Claude Opus 5 May 2026.
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.
